i have an 07 TRX 450r with an HRC kit and i plan on racing, but i was wondering what you guys thought would be the best pipe using the header that comes with the kit, and what will i have to do with my jetting?

 

dude i was lookin 4 an exhaust 4 1. the exhuast is called looney tuned it adds 10 hp at the bottom and 5.5 at the peak and its a s/o and it sounds awsome ive heard them on movies and stuff but ya thats my opinion u can check it out at
www.worldwideperformance1.com or www.lteracing.com
u should check it out