octogonal expasion chamber:devil:

so today i was in policecustody for riding a 47cc mini bike on the streets at the age of 15 aparently im fooked due to no licence registration speeding blowing off a stop sign and riding "wrecklessly" well now that thats over with i plan on making the wee littl bike faster. im goin to build a new frame with non crap welds and over all larger so i can actual put my feet on the pegs, i want to know if building an octoganal or similar shaped expansion chamber is sensible. i have all the tools except a pipe desinger to get dementions. is cone shaping the only way to get efficent flow and preasure waves? let me know thanks

wow...you got arrested for speeding, and you want to make your bike faster?:huh

haha now its a privet property only bike so yea who doesnt like going faster