Designed for EVO's running the stock MAS. Made from 3" 6061 aluminum tube. Comes standard with 2 vacuum fittings. Couplers and clamps *NOT* included. If your still running the stock turbo you will need a 2.5" x 3" reducing coupler for the turbo inlet, and a 3" straight coupler for the MAS (we highly recommend using a 3 ply coupler to the MAS over a 4 ply coupler, you will have a hard time stretching the 4 ply coulper). You will also need to supply a small peice of hose to connect the BOV dump to the recirc tube.