GM 12637647 is an update for the driver side exhaust manifold for your 2001-2016 GM 6.6L Duramax truck. It features a full bore, unlike the factory exhaust manifolds that were restricted, and will provide you additional clearance. The increased flow will enhance throttle response and better overall performance. This part is an exact replacement part for 2011-2016 GM 6.6L Duramax trucks.
GM 12637647 LML Duramax Diesel Driver Side Exhaust Manifold (Will Fit 01-16)
This is the new style exhaust manifold that GM has introduced for the new body style pickups. This manifold is now the factory unit on all LML trucks, but makes a great upgrade for all the 01-10 Duramax owners. This new manifold will flow better than the original OEM unit due to the reduced pinch area near steering shaft. This will greatly increase flow characteristics over the original unit and makes a great alternative to higher priced aftermarket manifolds.
Ensure proper torque and sealing by replacing broken, worn and rusted hardware with DHD's 300-110 Exhaust Manifold Bolt Kit and DHD's 300-112 Large Flange Up-Pipe Bolt Kit.