capn'
where r you going to run your tuned pipe I guess I should say route it? will you build a tunel like most patern planes
or just let it hang out in the breeze?
im torn about the porting question . most of the guys that I know who fly patern use tuned pipes but none that Iknow of do any porting work on their glow engines .
however I do beleive the book about how a tuned pipe works ,I also know that a dirt bike for off road use will have hotter porting thats why a pipe will work so well on them. I cant recall ever seeing a tuned pipe\expansion chamber on a stock street bike but I wasnt into street bikes that much.
then again ,a tuned pipe properly tuned should give some benifit to a stock engine with no porting so the real questionis how much can you get from it without mods to the port and will it be worth it from a time and money standpoint.
I think you stand to gain from either porting or from a tuned pipe but really get your moneys worth from using them together.someone had one one a ryobi not to long ago and reported that they thought it sounded like it was turning up more but didnt have there tach durring the run .if you give it a try let us know how it works out