Big boost and big RPM's increase the amount of crank-case blow-by causing problems for the stock engine breathing system as it very quickly becomes overloaded. This can lead to oil being blown into the air-intake, increasing the possibility of detonation due to oil entering the combustion chambers. This can be solved by fitting AVO's oil/vapour separator tank kit, which removes oil mist from crankcase gas before it is returned back to the engines air-intake.
Applied Models:
Impreza WRX: 2002-2005 [2.0-liter turbocharged]
Impreza WRX: 2006-2007 [2.5-liter turbocharged]
Impreza WRX STI: 2004-2007 [2.5-liter turbocharged]
Forester 2.5XT: 2003-2008 [2.5-liter turbocharged]
