1968 C3 CORVETTE Exhaust system components are made from 14 gauge (.070) aluminized pipe. Original factory exhaust systems came on the car with the secondary pipe welded to the muffler. System Includes: 1966-1968 BIG BLOCK (427) MANUAL (4 Speed) Front Exhaust Pipe 1968-1972 2-1/2" MANUAL (4 Speed) OEM Style Welded Muffler 1962-1974 2-1/2" Exhaust heat riser valve (Excluding FUEL INJECTION) 1962-1974 2-1/2 " Exhaust heat riser gasket 1968-1972 Muffler exhaust hanger w/hardware 1968-1969 Stainless Steel Exhaust Extension 1964-1977 2-1/2" Center Exhaust Hanger Bracket