Just installed the FMF power kit!!! I have a zipty factory pro jetting kit and a boysen quick shot installed. The power kit comes with the Q2 pipe and the power bomb header along with the Power now from scary fast. The retail on the kit saves about a hundred $ over separate and got 20% off that. So, I cant even believe the bike now, If you were looking for low to mid power gains I strongly recomend this kit. My riding pal who is also the one I bounce everything off of was amazed at the power. He is an expert class desert racer who has done vegas to reno and lots of local racing. He rides a 2005 CR450r and he had ridden my bike stock and was less than impressed. after the free mods the jet kit and the pipe he thinks my bike may be faster than his!!!! but the low end grunt is the best gain!!! Im jones'n to ride again after 40 miles yesterday. hope this helps put a smile on someone elses face Oh and the pipe sounds great!!! and is still quiet!!!!