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The direct-injected Subaru FA20F engine in particular has an inherent problem since there are no port injectors to clean the backside of the intake valves
Includes air duct that directs cold air through the oil cooler core
For a maintenance-free solution
LISTEN TO THIS EXHAUST ON WRX
Radium Engineering 08+ SUBARU STI ONLY FPR Kit Color:Green The direct-injected Subaru FA20F engineThis kit is designed for use in the USDM 2008 2019 Subaru WRX STi (EJ257 only) and replaces the OEM fuel pressure regulator and damper assembly, shown below. The factory STi fuel line routing uses a quasi dead end system that circulates fuel through the regulator, bypassing the engine. Fuel is only routed to the engine when there is demand. The Radium FPR kit replaces the factory regulator and re routes fuel to cycle through the engine's rails before