Exhaust Manifold Headers for Pontiac G8 (2008-2009) 6.0L 6.2LHigh Flow Exhaust Manifold Headers for 2008 2009 Pontiac G8 Designed specifically for the GM Zeta platform, these exhaust headers replace the restrictive cast iron factory manifolds to significantly improve exhaust scavenging and lower cylinder head temperatures. The Stock G8 Exhaust Manifold Bottleneck The factory OEM exhaust manifolds on the 6. 0L L76 and 6. 2L LS3 engines utilize a heavy, cast iron log style design that prioritizes compact