This system is a reproduction of the original system out of our 1963 Corvette. The original system consisted of 2 1/2″ front pipes 2 1/2″ rear pipes and 2″ outlet mufflers with stainless steel extensions. Our system comes 14 ga aluminized with the correct front pipes with jut out to correspond to under seat┬ápackage tray. correct flanges, extensions, donuts, sealant, guillotine clamps, mufflers, installation instructions and diagrams. Reproduction center,and muffler hangers are available as well as stainless steel tips, heat riser and stud kit. Ask about our concourse show package. for the hobbiest who can’t stand surface rust. (Mufflers are available in standard and off-road N-11 packages)