There are those companies out there who claim this chip will increase the horse power. But from my understanding this can shorting the life of the tranny. Personally my thoughts is GM was ludicrious to put that 4.8 into powering a 6000+ lb vehicle. The nucklehead engineer must of lived in florida where its flat. The 5.3 is plently of power, but even then, questionable on very steep inclines. Though my wife loves her HOE.