This high performance exhaust will take your 2006 C6 Z06 performance to a whole new level. Constructed by hand utilizing CNC cut exact-fit flanges, 1-7/8" tubes and 3" collectors. Named " smooth Flow" as result of their construction having no sharp bends and very few welds. These headers are manufactured by the same folks that worked with GM to produce and supply the headers for the LS-1 engines in ASA racing series. Threaded oxygen sensor bungs come installed.You are sure to enjoy the added performance and new, more aggressive sound from your Corvette. This kit includes new spark plug wire set. Also includes Random Tech Cats and X-Pipe.