Most bang for your buck in a 16G upgrade platform, the WRX/STI TD05H-EVO III Big 16G features the 39 lb/min proven performance of the EVO III Big 16G state-of-the-art compressor design combined with the quick response and high flow capacity of the TD05H turbine. The 7cm2 nozzle area turbine housing includes an internal wastegate port and standard wastegate actuator calibrated at 9 PSI. Optional upgrade actuators are available in incremental pressures from 10 PSI to 19 PSI. The WRX/STI TD05H-EVO III Big 16G is a direct bolt on upgrade shipped complete with coolant pipes and turbo oil drain tube installed and requires no modification to intake, exhaust, oil and coolant connections for installation.