OER Parts offers a selection of OE Style Manifolds for your 1971 Pontiac GTO. OER Parts offers 1971 Pontiac GTO Exhaust Manifolds without Smog Tube Holes, 1971 Pontiac GTO Exhaust Manifolds with Smog Tube Holes, 1971 Pontiac GTO Hemi Exhaust Manifolds, 1971 Pontiac GTO Ram Horn Exhaust Manifold, 1971 Pontiac GTO Ram Air I Exhaust Manifolds, 1971 Pontiac GTO Ram Air II Exhaust Manifolds, 1971 Pontiac GTO Ram Air III Exhaust Manifolds, and 1971 Pontiac GTO Ram Air I Longbranch Exhaust Manifold.