Those power numbers are not realistic at all for a cat-back alone, and Speed TV also used a SuperChips tune to get their numbers. In general, just about any cat-back may get you 5-10 peak horsepower. Frankly, we didn't have a noticeable difference in power on our own truck with the Heartthrob Kit versus any of the other cat-back systems we tested, and we consider cat-backs a sound upgrade more than anything else. Any tip with a 4" inlet will fit with the Heartthrob kit. Check out our Exhaust Tips Section for options.