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Larger piston valves and oil capacity allows for a faster reacting dampening force
CNC-machined flywheel
all of this can be avoided if you replace your timing belt at the required service interval
nickel-plated brass with proper seals to withstand the temperatures and oils seen in a boost control system
GSC Power-Division Single Valve Spring Set w/ Titanium Retainers - Subaru Models (inc. 2002-2014 WRX / 2004-2021 STI) Subaru-WRX-2025 Larger piston valves and oilThe Single Valve Spring Set will allow the Subaru STI to rev higher and run more boost with an upgraded valvetrain. GSC Power Division Single Valve Spring Set w Titanium Retainers Specs: Made using durable materials and construction Allows the user to reach higher boost and power levels that would be limited by the stock valvetrain Less stress on valvetrain components Lower spring frequency for more precise valve control. More valve control equals
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