The new high-velocity stainless exhaust manifolds from BD Diesel feature a unique stainless steel reflective surface which holds the heat within for increased velocity compared to ductile iron castings. The new design prevents cracking and maintains exhaust temperature and velocity to drive the turbocharger. The T3 turbo flange featured on these manifolds assist in increased velocity and can also be adapted to a T4 mount. These stainless steel manifolds can withstand temperatures in excess of 2000°f without cracking or warping. Once heated, these manifolds turn a gold color. Available gasket sets are sold separately.