Cast Iron Exhaust Manifold (101177) by ATP®. Position: Driver Side. Color: Natural. Header Coating: Uncoated. ATP Graywerks Exhaust Manifolds are a high quality OE replacement alternative. Each manifold is developed off of the original parts 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. Each unit is machine finished to guarantee flanges are perfectly flat, mount evenly and do not leak. These manifolds are backed by ATP limited lifetime warranty.