Perfect for your 400 HP WRX/STi project, the TD05H-18G features the 40 lb/min performance of the Mitsubishi TD06 18G compressor wheel combined with the quick response of the TD05H turbine wheel. To maximize compressor efficiency, the WRX/STi TD05H-18G utilizes a true TD06 compressor housing with custom actuator mounting in place of the TD05 housing. Standard wastegate actuator is calibrated at 9 PSI and optional upgrade actuators are available in incremental pressures from 10 PSI to 19 PSI. To maintain proper boost control, the TD05H-18G utilizes a ported turbine housing that is included in the price of the turbo. Like all of our WRX/STi bolt on upgrades, the TD05H-18G is shipped complete with coolant pipes and turbo oil drain tube installed to simplify installation. The WRX/STi TD05H-18G custom performance turbocharger is a direct bolt on upgrade and requires no modification to intake, exhaust, oil and coolant connections for installation.