SuperMAXX Stainless Long Tube Headers are an excellent way to bolt on 16 hp and 16 Ft. Lbs. of Tq. to your 2005 - 2013 C6 Corvette. Although a tune is recommended, these power gains were before the tune! A power tune could add another 20-25 hp. 100% Stainless Steel construction with a Limited Lifetime Warranty makes the SuperMAXX header second to none. 1.875 primary tubes and a 3.00 collector make a great combination for stock engines and/or upgraded power plants. Fits with automatic or manual transmissions and takes about 4-6 hours to install. Comes complete with a detailed, full color instruction manual for easy installation. O2 Extension cables, triple layer stainless steel gaskets, header bolts and all installation hardware are included. Designed for use with Dynatech intermediate sections (part numbers 715-63520 or 715-63530, 715-63540, 715-63550, 715-63620 or 715-63630).