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The 1975 C3 marked the last model year that a true convertible Corvette was available for purchase until 1986. Side pipes are loaded with reverse flow glass pack mufflers. Jump to Latest Follow 1 - 10 of 10 Posts. 1963-1967 Side Pipes & DoNuts Genuine big block car Vin# 1Z37W28522969 with Mako Shark tilt front conversion. Also, I have seen custom headers that mate with modified factory pipes. Chevy Corvette C3 Stingray Coupe T-Tops 4-Speed 350 427 Hood Side Pipes Serviced. C3 corvette factory side pipes Many New Parts and Mechanical Reconditioning.