2007 Trailblazer SS AWD 125,xxx miles. Tune from speed inc. Built Transmission, 3600 stall, shift kit, transmission cooler, 160 thermostat, Msd wires, ngk plugs, new tires about 3 months ago, just replaced the alternator 2 weeks ago pretty sure thats it. Catalytic Converters are cut off as well. Recently serviced all the fluids (differential front and back, transfer case fluid, trans fluid, oil.) Oil change has been done every 3,500 miles with Mobil 1 Full Synthetic oil.