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Manufacturer Part Nos: 13581AA051 (Upper)
A slight interference between the two springs helps dampen spring oscillations for more accurate valve control at very high rpm
Shifter stay front bushings are 95A durometer urethane and rear bushing is 85A durometer for solid and precise shift feel
Upgrade valve springs required
COBB Intake Tube & Filter Kit - VB WRX 22433AA542 Manufacturer Part Nos: 13581AA051 (Upper)SMOOTH FLOW COBB 3 inch mandrel bent aluminum tube with smooth flow and minimal restriction connects the factory airbox to the turbocharger inlet. The high flow replacement panel filter is designed to permit very high flow rates with long life. Reinforced silicone hose couplers complete the package. Because the factory airbox on these models now incorporates a hydrocarbon trap (an emissions device), a full intake system is no longer street legal. This
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