Tig welded from WELD ELL 304L 8GA Stainless Steel. Head plate and turbo flange are CNC cut from 1/2" 1018 mild steel. Jig assembled and back purged welded. Designed with T4 divided inlet turbos in mind. These turbo manifolds are designed for superior strength and performance. Available with your choice of 38mm MVS or 44mm V-band flanges. Fits larger turbos such as GT42R and BW S372.