Fits all Borg Warner S200 and S300 series T3 and T4 turbochargers with the discharge flange pictured below. Uses a 20 degree reverse tapered flange. Neither the flange nor turbine housing are flat like a v-band. We have this flange available for 3.00″, 3.50″ and 4.00″ tubing. All 3 use a standard 3.50″ V-Band clamp.