okay, since they dont make an exhaust for an 03 trialboss 330, im thinking i might go buy a cheap fmf slip on and have it custom fabbed up . but my question is, if i jet it and put a k@n on it with the fmf, will i get more power?

 

Almost certainly. Stock exhausts tend to use baffles to keep the noise down. Aftermarket systems are basically sound deadened straight pipes. More air flow + more fuel = more power FMF is a good choice, they hopefully still sell universal style slip ons. Measure the O.D. of your pipe at the can and hopefully they will have something that will match right up.