This is the same O2 housing we sell with our Big Turbo Kits. This fits T31 style 4 bolt outlet turbine housings and ends in the factory location with the factory downpipe flange. The housing is 3" investment cast stainless steel then CNC machined to perfect tolerances.

NOTE:  This O2 housing is designed around AGP's big turbo kits and a T31 outlet turbine housing.  We cannot guarantee that this will fit your pieced together turbo kit using parts from multiple other manufacturers.

100% Cast Stainless Steel construction