The 1968 Corvette big block manual transmission exhaust systems used 2 1/2″ front pipes and 2 1/2″ rear pipes. Our kits come 14 ga aluminized with the correct front pipes with correct flats on left hand head pipe, correct flanges, extensions, donuts, sealant, guillotine clamps, mufflers, installation instructions and diagrams. Reproduction muffler hangers are available as well as heat riser stud kit and tips are available. ¬†Our system comes with flats in the rear pipes as original and guillotine clamps for center exhaust hanger but opened style clamps for tips. Ask about our concourse show package¬†for the hobbiest who can’t stand surface rust. or our N-11 mufflers for a little more rumble.