As read in the topic I have an FMF powerline exhaust on my 03 vinson...it seems to work well while maintaining a low dB level of output. My friend who rides the same exact machine just picked up an HMF which is obnoxiously loud I must say however it seemed to flow much more air.

The reason I bring this up is because I have just picked up my final mods for the machine (see the bottom of my profile)...the only thing I can really do now is bore the old sleeve out and stick a huge piston in. I brought the head to my friends uncle who builds racing motors for an everyday living. He ported and polished the thing, flow tested it, messed a bit with the compression ratio...modified the valves...and then had custom valves made for the machine all for about 350 bucks. I have the web-cam which will be going in along with the new badass head however Im concerned with my pipe not being enough. Reading a lot of the FST vinson threads I have noticed that they say you have to use yoshimura or HMF because they are (the only pipes that can handle the mass flow of air)

Let me know what you guys think.

-Mike