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