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EJ207 D-AVCS (JDM STI MY08+)
Pistons - Cosworth 4032 Forged 8
DFV opens more quickly and easily during minor road imperfections
rough running condition
GSC Single Valve Spring and Ti Retainer Set EJ A/F Sensor EJ207 D-AVCS (JDM STI MY08+)KEEP YOUR VALVES UNDER CONTROL GSC's singe cylindrical valve spring kit is their entry level performance valve spring option at an economical cost. The lower open pressure is ideal for milder cam options and or less extreme rpm conditions.. Upgraded valve springs are essential for controlling valve movement with more aggressive cam profiles. A higher spring rate is also necessary under high boost conditions due to the manifold pressures acting against
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