The Forge free-flowing charge pipe kit will increase flow and improve the reliability of your B58 engine from BMW that is used in the A90 Toyota Supra. These high-quality aluminium pipes are a direct replacement and will fit in place of the OEM plastic pipe.The OEM pipe can become brittle and fail under increased boost pressure, so we have developed a replacement with an increased diameter, which helps to reduce turbulence and maximize flow into the engine. The boost pipe also has 2 x 1/8th" water meth/nitrous bosses incorporated into the design for tuners to keep inlet air temperatures on the safer side  while pushing the B58 engine to its limits and aiding the option for a maximum power output.The 1/8" NPT bosses can also be used to monitor boost settings when plumbed to boost gauge with the suitable adaptor (not supplied).Lightweight high grade 6061 Aluminium pipingReplaces the factory soft plastic charge pipe which is prone to crackingIncrease in throttle response and reduces turbo lag Includes all hardware and instructions for complete installationSilicon reducing coupler included Black powder coated finishPrecision CNC machined MAP sensor boss, turbo and throttle body couplers