This is the Basic kit and does not include a blow off valve. We can upgrade your kit to the next one up with a BOV and tig welded seams for an added cost. (includes all piping and couplers for a stock T-3. other turbo couplers available) (tig welded seams extra) An inexpensive way to upgrade your Turbo Z or ZX – Turbo Intercooler with piping kit designed to fit any S30 chassis with minimal modification. (Radiator fan must be replaced with an electric fan to clear intercooler piping) – It includes all piping, couplers and clamps necessary for installation. – The core measures 21″ x 8″ X 2.5″ Piping is 2.25″ for quicker boost response. – Tested on the DYNO for repeatability