I'll probably have 1'000's questions if I try this so here goes. Going beyond a muffler mod to a pipe( expansion chamber ) what does this take. Could you adapt a small bike pipe to a saw or is it all custom. I think I might want to get into some competion with my 2171 just not sure where to start, I have allready given the saw a muffler mod and woods port it runs great but I am addicted and want more now where should I start?