Does anyone know who has the best prices on an x pipe. Does adding the performance exhaust change the gas mileage. I had a Hummer before and changed out the air intake and exhaust and that increased the mileage about 2-3miles/gallon.(also made the truck sound just mean!!)

Yeah it might change the gas mileage some.. but barely if any..It also obviously depends on how you drive the car...Common knowledge is getting an intake and a better free flowing exhaust will improve the mileage a tiny bit. But again, it depends on how you drive her. Most people getting performance upgrades aren't doing it for the gas mileage..:thumbup: