I just installed the gytr exhaust and a K&N filter on my 07 wolverine. I also had my dealer install a "dynojet" jet kit but haven't noticed any increase in top end speed. Are these mods solely for low and mid range power? Or am I missing something? The service dept put the 132 main jet in (as it said to do in the manual for my elevation ).

 

Yes, the mods you listed will give you great gains in the low to mid range. Topend wont be effected much, sometimes it actually loses some. Good luck.