TRX450R muffler on 350X......

[MO350X]

Hey folks!
New member here.
'85 ATC350X owner and PROUD of it.
My bike came with a JUNK, way-too-loud no-name silencer on it so I went on the prowl for a new one.
Not wanting to spend big money on another too-loud one, I drove over to my brother's house.....to get some measurements off of his brand new 450R.
Guess what....450R mufflers WILL fit.

I picked my "ridden twice"/Perfect/LIKE NEW unit off of Ebay for $31.49 including shipping and headpipe (which I didn't use).
STAINLESS STEEL and Honda quality through and through.
I only had to do a TINY bit of welding to mount it and it looks/fits FANTASTIC.

Quiet? OH YEAH?
I'm sure there is a herd of folks wondering......
Did I lose any power? Not that I can feel.
Think of it this way.....
Honda put that beauty on it's baddest of the bad 4 wheeler.....you think they make it restrictive? The answer is NO.
I'm thrilled, it was an inexpensive fix and it looks GREAT!

Check out the pic.
Let me know what you think.
Thanks again, folks!
MO350X

P.S. There were a few more stock 450R mufflers/headpipes on Ebay when I got mine. CHEAP, too.

[200xalltheway]

I'm lovin' it. :p

[BigGreenMachine]

Looks great, welcome to the board.

[newbie 350x]

Can you post some close up's of the mods that you did have to make. That pipe sure looks good on that x.

[MO350X]

Okay...here goes:
1. Rear mounting bolt: I welded on a bolt to the original grab bar to use as a mounting "stud" (see pic). Those with aluminum grab bars COULD drill a hole and just put bolt through the hole tightening with nuts....unless you're lucky enough to have a TIG welder just "laying around". :rolleyes:
2. "Mid-Pipe" mod: I cut the forward/middle portion of my old junk silencer and used it. The only mod I had to do with it was cut a SLIGHT "pie" shape out of it to sharpen the angle that the pipe met the new muffler. EASY weld/mod with a wire-feed welder and SawZall (or cut-off wheel?). This MAY NOT have to be done with different brands of mufflers OR even stock muffler/pipe. But I can't say for sure.
3. Rear Master Cylinder Resovoir Mount: Bend it's mounting bracket slightly rear/inward for resovoir and hose clearance (see pic).

NOTES: STOCK head pipe is NOT modified. The 450R muffler comes with an awesome GRAPHITE seal inside the area where the clamp is AND the clamp is fantastic. Try and save everything you can! You won't regret it!

All I can say is take your time and make 'er fit and seal TIGHT.
This isn't brain surgery! :D
It took me 2 hours to do the WHOLE job: start, finish, clean-up.
And I DO NOT have a shop; just me and my creative mind in my garage.

Keep telling yourself......A Stainless HONDA replacement muffler for CHEAP (got mine for $31.49 TOTAL) and two hours of my time? Oh yeah! Worth every minute. ;)

By the way....this muffler MAY fit other models....for the quality of construction and the availability of them used, it's WELL worth the effort.
We may as well cash in on those silly 450R folks "throwing them away"! :)

Thanks for all the interest, folks.
Hope this helps keep many more trikes on the trail!

[newbie 350x]

Sweet. Thanks for the pics MO350X.

[TrikeKid]

holy giant silencers batman! good idea though even if it looks kinda like a fart pipe.

[OldSchoolin86]

from this angle it looks like the tire will hit it. As far as looks it's kinda sweet. It's got the crotch rocket can look.

[MO350X]

Hey all!
Don't worry..it won't hit the tire.
PLENTY of space.
Sorry about the picture angle.
I posted a picture to better show that fact.

I hear you....it's a biggen. :p
I like to think of it as the "CBR900R look". :D
But it's 100% Honda quality, 100% stainless Steel, it flows well and it's QUIET to boot!
It's NOT heavy, either.
It's heavier than my old silencer but the oldie was a no-name, loud piece of JUNK.

Glad to be of help.
Any more questions?
Don't hesitate to ask.

[ATC crazy]

Welcome to the boards MO! Great tip you posted...Im sure other 350X owners have wanted something than a loud Cobra/DG pipe for a while now.

And since the stock 450R muffler fits...that means just about every aftermarket slip-on muffler for the 450R should fit too. I, myself, have been wondering if the universal Whitebrothers E-Series could fit.

[Billy Golightly]

Thats pretty slick, nice going. Welcome to the site too. Mind if I make a link to this thread on the Tech Tips page? :)

[X350X]

i wonder if that would fit on the larger head pipe of a cobra exaust?

[motoman1012002]

where at in missouri are you in. Im in sedalia

[RichinMO]

Hey fellow Missourian! Have you had the chance to bottom it off a big jump? Just wondering if it will hit the caliper.

[OldSchoolin86]

It looks even better in that pic!

[MO350X]

Thats pretty slick, nice going. Welcome to the site too. Mind if I make a link to this thread on the Tech Tips page? :)

Feel free to.

I'm learning the ropes to this forum.
So far, it's fantastic!
LOADS of features/choices I haven't seen before.

Thanks!

[MO350X]

Hey fellow Missourian! Have you had the chance to bottom it off a big jump? Just wondering if it will hit the caliper.

I am about 25 miles due south of St. Louis.

To tell you the truth, my bike gets pretty pampered with my riding style.
Would it hit?
I don't THINK so.
The big muffler is off to the side "just enough" to be out of the plane where the caliper would rise on a hard bottom-out.....I think.... :)

Take care!

[MO350X]

i wonder if that would fit on the larger head pipe of a cobra exaust?

It's measurement on my "no-name" exhaust was 1.5" (approx.) O.D..
The stock 450R is approx. 1.5" as well.
Is a Cobra the same OD?

[MO350X]

Welcome to the boards MO! Great tip you posted...Im sure other 350X owners have wanted something than a loud Cobra/DG pipe for a while now.

And since the stock 450R muffler fits...that means just about every aftermarket slip-on muffler for the 450R should fit too. I, myself, have been wondering if the universal Whitebrothers E-Series could fit.

Well, I did the install because of the lack of a stock or quiet 350X replacement.
All the originals are either annhiliated/demolished or TOO pricey.
With the 450R, I got a stainless steel, MODERN design beauty for less than I had been seeing old worn out original mufflers.

Personally? I wouldn't shell out the cash for any of the 450R aftermarkets.
Those things are outrageous.....at least most I've seen.
My brother has been pricing them and the "performance per dollar spent" is completely off balance.

Check out the sweet Honda HRC Power-Up kit for the 450R.
Do you see a pipe or silencer upgrade? Nope.
Just a new end cap for MY muffler (stock 450R) with a larger outlet.
Check out the pic of the kit below for the end cap.
Makes you think, huh?
I've seen a knock-off of the end cap on Ebay by an independent maker.
So you can get the cap alone, do a jet change and get some more power for chump change.

Just my 2 cents, though.
I hate to see someone spend foolishly and get VERY little improvement.

[TrikerR]

nice choice of a first post...a wikid sick tech tip, and welcome to the forum

[MO350X]

nice choice of a first post...a wikid sick tech tip, and welcome to the forum

I kept telling myself to join this site.
I used it a LOT while shopping for a three wheeler.
I came "this close" to getting a PAIR of Tri-Z's and a SHED full of Z parts but the Z's were a little too "high strung" for my riding habits.
One was NICE the other was rideable but in need of attention.

Glad I went with the X, though.
It fits me to a TEE!
Size of the bike and the power is JUST right.

Being on a budget, I KNEW there were more folks on here in the same boat as me......so posting an inexpensive "upgrade" like my muffler was a given! :D

Anyhoo.....now I just need to find some spare time to ride that bad boy!!
Darned grave yard shift. :(

Take care, folks!

[Fox250R]

why would anybody wanna do that to their 350x??

[vartiak15]

are you serious?

[MO350X]

I'll just restate the reasons for why I did the install.

Aftermarket versus 450R comparison:

Aftermarket is unnecessarily LOUD.
450R equals quiet/efficient power.
Aftermarket is made out of painted steel or thin aluminum, usually.
450R is 100% Stainless Steel.
Aftermarket is based on 20+ year old technology.
450R is 2004-2005 technology.
Aftermarket provides VERY little (more than likely NO) improvement over the muffler I installed.
450R is from the strongest, most high-tech 4 stroke ATV Honda has ever produced so it stands to reason the stock muffler FLOWS VERY WELL. Again....see the Honda HRC Power-Up kit: Do you see a replacement muffler? Nope...just an end cap with a larger outlet for the stocker.
Aftermarket costs 3+ times what I spent for the 450R.
450R mufflers are available only slightly used on Ebay for a song.


Thanks for listening, folks. :)

[Wickedfinger]

Aftermarket is based on 20+ year old technology.
450R is 2004-2005 technology.

Might I interject that the 20 year old technology might be whats best for a 20 year old motor .......

Regardless of anything else, from what I've read, what you have mounted there is MUCH better than what you had on her and you can't beat the price you got it for. It looks to me like you could mount it without welding the frame simply by using a small piece of metal stock and a longer bolt for the rearmost grab rail mount or by "straddling" the two rail mounts with a longer piece of flat stock or slotted stock and mounting it. Personally, I would probably just take your "aftermarket grab rail" advice, and just drill a hole through the frame.

[OldSchoolin86]

If someone wanted to make a couple of bucks they could make some adapter kits real easily.

[MO350X]

Regardless of anything else, from what I've read, what you have mounted there is MUCH better than what you had on her and you can't beat the price you got it for. It looks to me like you could mount it without welding the frame simply by using a small piece of metal stock and a longer bolt for the rearmost grab rail mount or by "straddling" the two rail mounts with a longer piece of flat stock or slotted stock and mounting it. Personally, I would probably just take your "aftermarket grab rail" advice, and just drill a hole through the frame.

Believe me, I don't claim to be a master fabricator. :p
I just "got it mounted safe and secure".
I'd LOVE to have an aluminum grab bar, mine is in horrible shape.
I'll end up doing the drilling/mounting if I get my hands on one in aluminum.

I have a 110V wire feed welder that is SOOOOO handy for these little fab jobs, that it's almost easier to grab it and go than to set up and drill! :D

[MO350X]

If someone wanted to make a couple of bucks they could make some adapter kits real easily.

Since we all know that there'll be a LOT of these 450R mufflers thrown away in the near future by all those mislead folks throwing a mountain of money at their new bikes in the pursuit of more power.
Just like our beloved dinosaurs had done way back when.....that's why it's so hard to find a good original.

We may as well cash in on all those 450R mufflers being tossed! :)

I'd LOVE to do a kit like that but I don't feel like dealing with the inevitable cry-baby's and folks who don't know a wrench from a door knob.
Yes, they'll be the minority but it only takes a handful of them to drive you whacko and destroy the profit margin. ;)

[350Xccelerator]

thats awesome, so if a stock 450r muffler will bolt up, so will an aftermarket 450 muffler, awesome

[AirManCam]

Can you get some pics of the "junk" muffler? I might be interested in it. And can you get a sound clip with that 450r muffler on? I am thinking about replacing my cobra, because of the too much noise/ too little of a power gain. And did you notice a power gain going from one to another?

[MO350X]

Can you get some pics of the "junk" muffler? I might be interested in it. And can you get a sound clip with that 450r muffler on? I am thinking about replacing my cobra, because of the too much noise/ too little of a power gain. And did you notice a power gain going from one to another?

I can't say I noticed any power gain nor a loss.

I don't have any way of getting you a sound clip.
But, if you want to hear what it sounds like, truck on over to a Honda shop (or a friend who owns one) and listen to a stock 450R.
My 350X sounds JUST LIKE the 450R.
I compared it to my brother's bike. Uncanny. :)

I attached a pic of the old pipe.....it's not pretty, believe me.
I have another person interested in the oldie right now so he gets first dibs on it.

Take care!

[vartiak15]

you might have a rare pipe on your hands there.

[350xsx]

800 some odd dollar white bros pipe comin for the 350x as soon as i get a LOTTA extra cash!!!I love it

[OldSchoolin86]

For 800 you could have a custom pipe made for you.

[350xsx]

yea i know im goin down to an LRD or yoshi

[350xsx]

but whos gonna make me a custom pipe with the experience and technology that a $850 pipe has?

[OldSchoolin86]

I won't say it doesn't take skill, but it's not rocket science either to build an exhuast. It doesn't matter what your building it for (talking 4-stroke) the same things apply. You want smooth flow that breaths well. How much more will you gain from buying WB system compared to a DG Excelerator? Unless you have extreme motor work done it won't be cost effective. Now if you want to have a WB system that bad then that's cool. more power to you. The fact is that a custom headpipe designed to run into an exsisting WB silencer out there will be just as good. Most likely if WB made a system it would be like thier others but they would charge you an trailprotrailprotrailprotrailprotrailpro load because they won't be moving as many as they do for todays popular models. I still say that we as a 3WW community need to find more ways to retrofit more products so that we can use todays tech and not have to wait on the big manufactures to make them again.

[AirManCam]

I better have second dibs on that baby!!!!

[vartiak15]

so what kinda pipe is that one he has there?

[AirManCam]

I beleive that is a bassani!
EDIT: I believe it is a jardine.

[Xowner]

hey take the end cap off trailprotrailpro 450R pipe and tell me how it sounds!

[Xowner]

oh BTW you just cut up a rare jardine exhaust!!

[ATC crazy]

800 some odd dollar white bros pipe comin for the 350x as soon as i get a LOTTA extra cash!!!I love it

LMAO....so what are you doing? Paying Whitebrothers to custom build you a 350X exhaust system for $800??

Why not buy their universal slip-on and take it to a muffler shop for $50 or less and have them make you a pipe to connect the muffler to the header :rolleyes:

[vartiak15]

im guessing like 15 bucks to make an adapter.

[350xsx]

no no no they make one already but i would just need the silencer so i could just find one on ebay or somethin but like i said before id rather have an LRD for cheaper, but it doesnt matter unless i find another 350x roller now cuz i found what ive been lookin for, a XR600 motor to put in it, but its worked and a 660, so my 350x motor is goin to get rebuilt and put in a box on a shelf until i find a roller : ) im happy now

[350xsx]

and i could weld up an adapter for it anywayz or bend one up,i have the welder and my uncles gotta pipe bender

[MO350X]

Nothing like talking trike. :D

I'm with you guys....paying BIG $$$ for a pipe for our bikes just isn't cost-effective.
It would take a monster engine with a HEAVY breathing cylinder head to warrant a mega-dollar pipe....that may not even flow any better than a Cobra or DG.

See my next post about pipe diameter vs. horsepower.

[MO350X]

You guys got me thinking.
I have built numerous car and truck exhausts in the past and have used Flowmaster's charts and recommendations....not always their mufflers.....for pipe diameter vs. flow.

Here is what they say:
The size of pipe used in an exhaust system is a critical item to consider. Pipe diameter will affect the sound level and performance characteristics of the muffler, but keep in mind that bigger is not always better. Too large of a pipe can actually hinder exhaust scavenging by allowing atmospheric pressure up the pipe.

That being said, we have 1.5" tubing from the manifold back (the manifold HAS to flow plenty, just look at it).
Their chart doesn't go down to 1.5" but you can exponentially figure what that pipe will flow by using the closest pipe dia. in their chart: 2".
ONE 2" pipe will flow 100HP in a 150-200 CI engine.
And we're dealing with a MICRO engine compared to that.
Correct me if I'm wrong but 1.5" dia. exhaust on a 350cc engine should be capable of WAY more flow than we'll ever use or need.
So no matter what, our mufflers are probably overkill in the first place.....leaving muffler choice to more of a brand or sound preference.

Sound logical?
Maybe it's the graveyard shift talking? :p

About removing the end cap:
I've heard the Honda HRC end cap....pure thunder baby!!
Too loud for me but definitely Awesome.

Thanks for listening, folks.

[350xsx]

alright alright sorry :) thanks for the info tho

[MO350X]

alright alright sorry :) thanks for the info tho

Just trying to save a fellow triker some time and money.

Keep the dinosaurs on the trail!!!!!!!!! :D

[350Xccelerator]

now all you need to do is get an aftermarket 450r pipe and mount that up :beer

[MO350X]

But most aftermarket slip-on mufflers for the 450R are pricey! :eek:
AND LOUD as hell! :confused:

My brother has a 450R and he's contemplating hop-ups.
He'll probably use the HRC kit.
That would be plenty improvement without the excess noise.

[350x250sx4life]

If the stock 450R exhaust will fit on with little modification would that mean that an after market exhaust for the 450R would fit and that would give it more horse or am i wrong i mean for some more money u could have more power, but i guess the stock with end cap mod is good to i was just wonderin

[KASEY]

i used a kool stainless muffler off a WR450 yamaha,, on my 350x,, its smaller an shorter than a 450r muffler,,, sounds great only 88 db's too,,,, real easy swap too :D :D :D

[MO350X]

Post a pic or two!

[02blzrx]

just got mine in the mail. So Far, I will not be completing this tonight as my 4 12/ cutter is at the sisters house, but one thing I Have done diffrently so far is, I Unbolted the brake reservoir thing and just slimply flipped it the inside of the frame and bolted it back up. Then I put an extra heat sheild around the hose to be safe

[02blzrx]

Also, i am going to-do all I can to just use the rear grab bar bolt instead. I am thinking of picking up some exhaust tube from autzone and making a middle piece so I dont have to cut anything. Because if that work I can then A) keep the stock exhaust B) sell the stock exahaust and recoop the $ I spent on the ebay one :-) C) Put it back on after I realize I mangled some parts together and it runs like poooh ** Most likely C

[sportvette]

i just got a 450r muffler, but it has the HRC end cap. Anyone have an extra stock end cap???

thanks,
mark

[ClayW]

I have the original stock tip assembly/arrestor. You want it? Maybe we can trade for your HRC tip. I currently have a HRC tip on my 350X. I love the HRC tip. Deep sounding exhaust. In my opinion its not too loud. Its quiter than the cobra and supertrap. Just right. My 87 BigRed with the cobra pipe is louder than it.

[sportvette]

Clay,

Can I purchase your stock end cap? I havent put the muffler on, but I was afraid it would be too loud, also I am a little afraid of getting caught in the forest by a ranger and the pipe saying "competition use only" on it.

Thanks,
Mark

[MO350X]

Clay,

Can I purchase your stock end cap? I havent put the muffler on, but I was afraid it would be too loud, also I am a little afraid of getting caught in the forest by a ranger and the pipe saying "competition use only" on it.

Thanks,
Mark

If you have the Honda HRC tip, it already has a screen inside.
I'm assuming this is the spark arrestor.

Believe me, the HRC tip is nowhere NEAR as loud as 99% of the aftermarket pipes out there.
I rode with my brother yesterday and his 450R has the HRC kit.
AND my 350X had the 450R muffler with a tip I made that closely replicated the HRC tip.
In my opinion?
The sound is "just right".

The stock tip is VERY quiet....nothing wrong with that but if you have the HRC already, keep it.
Get to work installing that muffler and go riding! :)

[ClayW]

Man you can have it. I dont need it and wont use it. PM me your address. I will mail it out to you sometime this week. No biggie. Sholdnt be but 5 bucks or so to mail. You can just owe me a favor. lol :beer

[83185s]

ok heres a good ?...when making a pipe..should you bend it or cut and weld?? which has more power? which would save you money..taking it to a shop to bend or cutting and welding yourself? if you have a shop and a pipe bender then more power to ya but some of us dont even have a tool in the garage (exaggeration) ...like some poepl dont have a welder..would they be better off having a shop bend it and then clamping it together with exhaust clamps or buy a small 110v wire feed and welding it?? im just trying to find out what would have more power and be less costly..also less time consuming...you seem to know alot about making exhaust and by the way that x looks bad trailprotrailprotrailprotrailprotrailpro!!!

[ClayW]

Man. Just take the bike to a muffler shop. Thats what I did. I bolted the muffler up where I wanted it on the frame, and told them I needed a midpipe made and welded on to the muffler. That said no sweat. 10 min later it was done. Perfect. Gave them $15 and I was on my way. Not worth the hassel for that price. THey have everything needed to do it right. And no I dont live in the sticks. Just outside of Atlanta. So if anything I paid more. Oh yeah, it looks and sounds perfect, no leaks. :beer It was ready to ride when I left the muffler shop.

[83185s]

hmm..well i dont have a truck and i do live in the stix...lol..so i have no way of getting it to town...i mean i can borrow somebodys or have them take me to one but see i jsut dont know..ok heres my problem..someone that had the x before me cut the exhaust port place off of the pipe..so i hvae everything but that little thing that bolts it to the engine..i dont think that a machine shop has one of those laying around..but i can take it to my shop class and take the one off my 185 and weld it to it..and clean it all out first and maybe bore it first before welding..then it can work..but y do all that work when all i need is a headpipe for a STOCK exhaust..im thinkin just buy aftermarket and be done but i need to get the engine running first...but my ? is which has more power..ive heard that the bent ones do but with the cut and welded ones you would have more backpressure..which is good but too much is bad..its a big deal if you think about it

[JIMMY1143]

Looks really sick! I just purchased my 450r muffler for my "86" 350x off of ebay and should be here any time. Thanks for the great "pic's" and instructions.

[factoryfat]

Has anyone else done this mod? Just looking for more information on how it went and how it works. I have picked up a used pipe from a 2004 450 for $20 cash and would like more info before hacking my pipe apart.
Thanks!

[ausatutah]

I seen this post after searching for a cheap aftermarket muffler (LOL:lol: ) for my 350x, so after seeing this I also went on ebay and bought me a 450r muffler (with head pipe, want it? let me know) and a HRC tip, They hav'int arrived yet but soon as there here and on the bike I will record sound files with stock and HRC tip and post them on here, CAN'T WAIT lol.

[ClayW]

I did it. Went easy and sounded great.

[adamcostello31]

it looks a bit big dont ya think?.. if it was me i wouldnt have done that but its your bike lol

[ausatutah]

got my muffler on friday and toke it to Ricks Muffler here in Utah on saturday, toke him and hour and he had it done, I hav'int got my hrc tip but I've ran it with the standard tip and its real quite but sounds good, I've also ran it with out the stock insert and it sounds hella good, not real loud but deep and loud enough to sound like an aftermarket pipe, I love it. Soon as the tip comes in I will get some sounds for everyone.
and it does'int look that big inperson, I thought the same thing but it looks great.

[MN250R]

You did a excellent job making that 450r exhaust work.
I would definettly do that to a 350x if i ever get one.
I to cant stand the loudness of aftermarket 4 stroke exhaust:TrikesOwn

[ClayW]

It sounds much better with the HRC tip. It does not look too big for the bike. You would have to see it in person. Looks nice.:beer

[NOS_350X]

I have a stock 450 exhaust if anyone wants to buy one.

[Trike Dude]

I have this same set up on my 350X but I have a custom bent mid pipe that goes to the original head pipe. I am going to be selling the whole set up soon if any one is interested.

[AirManCam]

I have two stock 450r exhausts off of my 450s if anyone wants them shoot me a pm.. One has the HRC tip, and that tip is hardly a reason to keep the stock exhaust heh...I went aftermarket, and would never go back to stock.

[cartmanchubs]

It is a good idea and does look sweet but it looks like one of those old little honda civics with one of those huge tips that sounds like a lawn mower......

[cragster]

So whats the info on this. It works good. Will i have to cut up my stock pipe?

[slothminx]

Read the thread! all the info is in here.

[cragster]

Well i am bidding on a exhaust right now. Is 41 dollars shipped too much?

[cragster]

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=200005317493&ssPageName=STRK:MEWA:IT&ih=010

I won....39.80 or sumthing shipped!
This is gonna be cool!

[superchomper200]

New member guys, currently doing a complete frame off rebuild on my 350x, will put up a build thread, anyways like what you guys were doing with the 450r muffler so I just ordered me 1 from ebay! :)

[Dirtcrasher]

^ If you had looked in Classifieds, I've been trying to sell one with a midpipe already made up and an HRC tip :(

[The Goat]

you rag on me for adding material to a frame, yet put an exhaust that weighs 30 pounds on there! lol

[superchomper200]

Aww man! Wish I would looked there dirtcrasher! Brand new to the site and havn't saw everything yet!

[superchomper200]

What Jet size would you guys think would be good with the only mod being the 450r exhaust? Or should it run fine with stock jets? Thanks

[Dirtcrasher]

Unfortunately it doesn't do allot in stock form. You MAY be able to bump up the main one size IF you remove the airbox lid.

The HRC tip is 3 or 4X the diameter of the stock 450R tip and it allows you to jump up quite a bit more. They are hard to find for sale by themselves and cost roughly 38$ for the HRC tip. With the tip you can jump a few sizes and also bump up the pilot jet..........

You will also have to fabricate your own midpipe to get it mounted.

I think this is the link - http://www.3wheelerworldforums.com/showthread.php?t=70979&highlight=450R+350X - to the original fab work I did to get mine fitted up, hope it sheds some light on the whole swap :D

[superchomper200]

Sweet that answers my question, thanks.

[NOS_350X]

If you get the 400ex headpipe you dont have to create a midpipe. It will line up wiht 1 cut and weld of the headpipe.

[superchomper200]

I think the 450r pipe that I have may already have the hrc tip or something similar. How could I tell?

[Dirtcrasher]

The diameter would be about 2.5's give or take............