alright, friend of mine races his 450 and has the whole setup, fox float x fronts, podium rear, etc. he was running a yosh pro system (ti) but it got crunched by a "inexperienced racer" riding over his abilities behind him at a track. he swtiched to the sparks x-6 and said it has a lot more power than the yosh. I'm getting ready to buy a 450r and first mod is always an exhaust. I'm planning on the x-6 big core exhaust, identical to his setup, and sound isn't necessairly an issue, I'm just wondering: what is the hp gain on the full system, with supercharger kit and 190 main jet. and 2nd, what sound levels does the quiet and extra quiet insert bring the exhaust to? and anyone know x-6 BC by itself? THANKS!

RippN

 

no help?