Fits as a direct replacement for the standard manifold. It is a better, stronger and a more heat resistant replacement for the stock plastic (polymer) manifold. T6 heat treated cast aluminum that is CNC machined on the outside for perfect fitment and capable of a higher flow, which adds 3 to 5 horsepower. Especially above 124" the stock manifold becomes a restrictive part. Comes with a rubber o-ring seal. Easy to install, re-using all stock parts.

OEM replacement reference 27300121.

Note: For replacement o-ring seal see 974061.