I puchased a o7 exhaust with the step headear and installed it on my o6. I took the end cap off of the o6 and put it on the o7 and the bike is simply perferct. The new header lets it rev faster and gives it more snap. By using the 06 end cap it sounds and runs great all over the power band. I am wondering if anyone elso has done this. It feels better that my sons stock o7 and better than my friends 06 with a dr. D full exhaust.