I up graded mine right befor i installed my wildman tunes. It helped with the shifting and that to me was about all i felt. I installed tunes the next day so never got a feel for the power difference, if any. You want to find one in the DPC-422 family. if you pull yours and look at the sticker you will see, DPC-420...i think, mine did. by the way i paid 50 bucks for mine at the bone yard. good luck.