The STM DSM Recirculated O2 Housing is designed around the 38mm TiAL MVS Wastegate with your choice of all 5 colors. Bolts to Mitsubishi-style turbos and compatible with the STM 3″ downpipe or 2.5″ 2-bolt flange downpipe in the stock location. Hand fabricated in the USA, tig welded in-house of stainless steel with a mild steel turbo flange to ensure the bolts stay tight for a good seal. New gaskets and hardware are included.