Top mount equal length log design to provide support for a 4" downpipe in conjuction with T4 based turbos. The manifold is made from SUS321 stainless to provide a higher strength over SUS304 stainless. The manifold weighs approximately 16 pounds. This will fit all B-series motors in the following chassis, EG, EK, DC. There could be fitment issues for EF chassis. The manifold is flanged for straight T4 turbos. Wastegate flange is V-band / 44mm. This manifold is not A/C or power steering compatible. Head and turbo gasket is also included with the manifold. The manifold is made by OBX and carries a lifetime warranty against manufacturing defects.