Headpipe diam for 400ex, for 350x compare

[lynitup82]

I have a stock 450r muffler on my 350x but im thinking some more could be had with a larger headpipe that measures around 1 1/8 before the merge.
Im wondering what a stock 400ex is to compare since there are alot of online exhaust dyno information.
I know Supertrapp usually never uses a new headpipe due to them not not finding any more power with it.
My 200x really wakes up with the a Bassini that has a 1/4" larger pipe, stock is 1.100" to 1.180".

Thanks

[murfman]

I have a 400ex Exhaust in my shop to swap on my 350x, the stocker is the exact same size as the 350x I took off. The primaries are longer and the merge looks better, but as for sizes, they are the same, about 1.150 or so.

[lynitup82]

Thank you, thats everything i needed to know.