Killer B Motorsport 02-07 WRX-STi GD Air-Oil Separator Forged EJ Pistons Comes with spacer to fit

Comes with spacer to fit 5MT (for 5 speed transmissions)

Boost control referenced to gear

A tune is not required for the listed applications at any power level

all 4 valve cover fittings

Killer B Motorsport 02-07 WRX-STi GD Air-Oil Separator Forged EJ Pistons Comes with spacer to fitThis is a product weve been asked to develop for many years, and in that time there has been a lot of research, engineering, simulations, development, testing, (and repeat), with several different Subaru engines and build types, including stock engines. This process has occurred within many different seasons, exposing the Air Oil Separator to extreme environmental and driving conditions (daily driving, auto X, drag racing, dyno testing, etc.), as well