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It provides your engine with the largest amount of high-flowing air and delivers the highest power gains in most cases
All components designed
Includes silicone coupler and clamps
Direct replacement for the factory alternator cover
Radium Fuel Injector Pulsation Damper for OEM Rail - 2015-2021 Subaru STI PDM_cabin-filters It provides your engine withThis is the same Fuel Injector Pulsation Damper found in the stock fuel rails for the WRX STI. Fuel Injector Pulsation Damper This is the same Fuel Injector Pulsation Damper found in the stock fuel rails for the WRX STI. The opening and closing of the injectors creates pulses in the fuel rail, which can lead to unstable fuel pressure. This damper should be used (especially with high flow injectors) in order to achieve a safe and consistent rail