The compact design of Hedman Hedders LS-Swap Cast Iron Exhaust Manifolds makes them compatible with all LS-series engines, including both cathedral port and rectangular port head models. With an extremely durable construction, these exhaust manifolds deliver worry-free power, generate lower under-hood temperatures and reduce valvetrain noise. Available in your choice of a raw, Black Maxx Ceramic, HTC polished silver or HTC matte silver finish, these durable exhaust manifolds come complete with installation instructions. Hardware and gaskets are sold separately. Made in the USA