ATP Graywerks Exhaust Manifolds are a high quality OE replacement alternative. Each manifold is developed off of the original part’s specifications, to ensure it will install and perform like intended. This design is manufactured with high grade metals best suited for that application, from grey-iron to more advanced ductile and stainless steel applications. mount evenly and do not leak. Commonly needed upper and lower gaskets, along with lower flange hardware are included (along with heatshields and plugs if needed for the particular application..