My son has Hooker 2" primary headers on his Big Block Chevy powered 1979 Camaro with a 3" exhaust system that is bent like the stock exhaust including the tail pipes. Not a lot of room back there by the shocks, leaf springs and shackels and the rear sway bar end links but it fits. 2 1/2" exhaust will have more clearance.
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1971 Pontiac GT-37
Car is a junk yard dog and maybe one day will be restored.