350x exhaust question.

[NOS_350X]

Both exhaust's the stock 350x and 400ex exhaust have theses little welds that holds on the colars for the flange thing that actualy bolts onto the engine. If you take that stock exhaust and look down the 2 tubes that bolt to the engine youll see what i'm talking about. Just take a die grinder or something like that and grind them down smooth. Ill see if i can take a pic later tonight.

[kb200x]

Both exhaust's the stock 350x and 400ex exhaust have theses little welds that holds on the colars for the flange thing that actualy bolts onto the engine. If you take that stock exhaust and look down the 2 tubes that bolt to the engine youll see what i'm talking about. Just take a die grinder or something like that and grind them down smooth. Ill see if i can take a pic later tonight.

Is the 350x header and the 400ex header the same? Interchangable?

[HRC1]

If you go to supertrapp's website and download the instructions for the 350x pipe it tells you there is no gain to be had from a larger headpipe. BUT, that is on a stock bike as well. I have to dissagree and say that with a high comp and cammed motor that is ported such as mine is, a stock headpipe will be the cork in the system. Larger jets don't always mean more flow. There is a reason that almost all atv exhausts use larger headpipes. They flow better.

[SWIGIN]

i agree....bin there and done the grinded out stock header thing .....on a real built motor you need a larger header and pipe

[mudbogger]

The stock one I'm bidding on ends in a couple of hours, so I'll either be getting that one or trying to locate one here. Sounds like the stock is the way I'll definatly be going. Thanks guys for all the input.

I have 1 for you-it is rusted up pretty good-but it is surface only-PM me if you need it.

Also, has anybody ever measured the ID of the stock versus the aftermarket by chance -thats a good indication as well-they look very similair in some cases.

[NOS_350X]

Is the 350x header and the 400ex header the same? Interchangable?

No, it takes some cutting and welding to get it in there.

And guys that are doing the 400ex headpipe i forgot to tell yall that you need a longer brake hose also. Going from the resivor to master. Sorry

If you go to supertrapp's website and download the instructions for the 350x pipe it tells you there is no gain to be had from a larger headpipe. BUT, that is on a stock bike as well. I have to dissagree and say that with a high comp and cammed motor that is ported such as mine is, a stock headpipe will be the cork in the system. Larger jets don't always mean more flow. There is a reason that almost all atv exhausts use larger headpipes. They flow better.

Ill stick to what the experts say, not your interpitation. High comp, cam and ported dosent even start the list of what my 350x has done.

[SWIGIN]

o.d of most after market headers are 1 1/16 - 1 1/8 with 1 1/2 pipe

[SWIGIN]

Ill stick to what the experts say, not your interpitation. High comp, cam and ported dosent even start the list of what my 350x has done.[/QUOTE]




experts???.....ever see a tc 350x pipe or even a tc 250x pipe?

if a old team honda rider dont know what he doing id like to know who the ''experts'' are

[NOS_350X]

just measured,

aftermakrt: 1.14in

stock at the welds: .89in

stock witht he welds grounded: 1.12 in

[NOS_350X]

experts???.....ever see a tc 350x pipe or even a tc 250x pipe?

if a old team honda rider dont know what he doing id like to know who the ''experts'' are

Lets see what the dyno tells. Rider, not mechanic. It really dosent matter what tc or any other company says there trying to sell a product. Look at a boost bottle on a banshee, they do absoutly nothing but yet every company sells one.

[SWIGIN]

your saying tc is not a mechanic?

hes bin building motors for what....like 20 years

[mudbogger]

Thanks for the measurements -I apprec it!!

[HRC1]

No, it takes some cutting and welding to get it in there.

And guys that are doing the 400ex headpipe i forgot to tell yall that you need a longer brake hose also. Going from the resivor to master. Sorry





Ill stick to what the experts say, not your interpitation. High comp, cam and ported dosent even start the list of what my 350x has done.

Ya know i try to be professional when i post here, but i've noticed you like to contradict me. For one, I'm not just talkin out my a** when i'm posting. Have you ever herd of John Ziehl? He ownes venom performance, Builds some of the fastest TRX450R's in the country And is the inventor of the pulse charger exhaust, wich is on my 350X, the black widow piston and numerouse other improvements for the atv world. He's a buddy of mine and the person i consulted when building my motor. He's been building atv/motorcycle motors for 20+ years, and the first think i was told is ditch the stock headpipe, it's too small for what i'm doing. Especially after he ported my head. The stock header is fine for retaining low end torque, but will be the bottleneck in the higher rpm's. There's a reason why all aftermarket systems have a larger header, his pulsecharger system included. The same reason i had to go to bigger headers on my car when i installed AFR heads and a new cam and intake. The stockers wont cut it. I don't know what aftermarket header you measured but mine is marginally larger than the stocker. And i've seen the diff between stock header VS aftermarket on his dyno, not on a 350x yet, but on a 450r. Like trying to blow through a drinking straw vs a firehose... I did ask the experts.

[NOS_350X]

And i've seen the diff between stock header VS aftermarket on his dyno, not on a 350x yet, but on a 450r.

Well i have to agree, ON A 450 a full system helps drasticaly. But where not dealing with a 450. Then engine designs are completly diffrent. Just pull off the head and compare the 2, Try to check the valve clearances. There is nothing the same about a 450 and 350x except there 4 stroke. Here we are dealing with a dual exhaust port head. I live 30 minutes from Esr and Sparks racing, Ludas racing B&B racing. All engine builders have there strog points, The thing to do is find who does what and mix and match to suit your style the best. Really the onlyway to check what headpipe is best would be to put them on a flow bench and run it through the head then the headpipe. In that case porting would most likely make a bigger affect than a headpipe. Like i said before it all depends on what your building and how it all fits together, i have herd neomours times from many builders that you cant beat that stock system, unless your running a huge displacement. Ive built my 350x to run and she runs good, and would love to see you guys that think you have fast x's compare to it. But dotn think well see them next to each other anytime soon.

[jsimonh]

I didn't realize this was such a heated debate!
I have a stock headpipe on the way along with a supertrapp tail pipe. Even with the stock headpipe, I'm guessing it will be alot better than my full DG setup. If not, I'll put the DG back on and resell the other, but I doubt that will happen.