I suggest you read up on how a tuned pipe works and what it does then you will understand why I provided the advice I did.
ahem. the stinger or end of a tuned pipe is as important as the pipe itself... the books say it right there.
the wrong end will affect them. designing a good 2 stroke SILENCER is actually harder than the pipe... go rip the muffler off of your old cr250, take it for a spin and tell me differently.
the same applies to the front of the pipe. that length, those angles, those tapers....all very very critical. i turn my nose up at whats available for these engines cus, while they will work, to a point....they arent real. theyre made more to "look" the part.... having a piece of silicone tubing with hose clamps is not how you design a tuned pipe. they bear a striking resemblance to the pipes you find on the 50cc ebay quads etc... pressed seam welded tin can...
(unless someone can give me the actual design specs with graphs n stuff of these pipes from the factory in china that originally manufactured them to shut me up and make me feel silly)
not throwing dirt on the idea of twin pipes though.
if you can handle the stock power... and can bend pipe
would sorta look sick with good stainless turning pretty colours
but, now im thinking of it... what if you did run two tuned pipes? calculated with only half the port area each... i wonder.... and then even with two different tunes?
grrrrrr!! now i wanna experiment! these are things you cant find out about in books...