This LLY / LBZ / LMM Duramax Steel Compressor Inlet Flange for an OEM style Garrett VGT Turbo from WCFab is CNC machined from billet steel in DeKalb, IL USA. Designed to be used with the OEM GM LBZ / LMM Turbo inlet worm gear style clamp or WCFab's upgraded stainless steel t-bolt style inlet clamp WCF203-1 which is sold separately. This flange comes ready to be welded up by DIY fabricators who are building their own custom turbo inlets, and air intake setups for these engines. O-ring seal at face of turbo sold separately, see part WCF203-25.