Re: yz 80 need some help.
my idea, I GOT IT FROM BUILDING PIPES. do not question me on this, i am right. a larger exit will give you slighlty better response that is it.
a 'tighter' exhaust will create more pressure in the pipe, hence stuffing the chamber more which gives you more power. a larger exit will bleed off more pressure, and in effect, take away some magnitiude of the pipe resonance. next time do your homework before jumping all over someone. by the way, heres a pic of the pipes developed for my sled.