Went to no problem race track tonight, to run truck with my old plug behind superchip,obx lt,high flow cats into single three inch magnaflow muffler,underdrive pulleys,troyer fans,75mm tb, airraid cai,stock 3.55 gears, 285/70/17 tires on 17x9 DickCrept rims, truck weighs 5,000 lbs with me in it. I had a good time!