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Improves a quicker pedal response and allows the driver to maintain consistent brake pressure and precision brake modulation
274° Intake duration
modulation
High-strength aluminum alloy construction
Manley Performance Valve Spring Set - Subaru EJ Models (inc. 2002-2014 WRX / 2004-2021 STI) PDM_lifestyle Improves a quicker pedal responseManley Performance Valve Spring Set Subaru EJ Models inc. 2002 2014 WRX 2004+ STI The Manley Performance Valve Spring Set has been designed to accommodate high lift cams, and to allow users to surpass OEM rev limitations when power levels have been increased from built motors, larger turbochargers, aggressive cams, or ported heads. Basically if you plan on drag racing, time trials, or any form of spirited driving where the engine lives in the upper