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5" 304 stainless steel piping
The Stage 1 trunk kit includes new bolts and washers manufactured from extremely durable
- 4K RPM - 108db
Zinc install hardware is included to prevent rusting
Cobb Stg 2+ Drivetrain Pkg - Black Knob / White & Black Lockout - 2004-2021 Subaru STI 6MT Subaru-WRX-2009 5" 304 stainless steel pipingThe Uppipe: The Restriction Between the Engine and the Turbo The Cobb Stainless Steel Uppipe for the Subaru replaces the restrictive factory unit between the exhaust manifold and the turbocharger. The factory uppipe contains a flex section that collapses over time and a catalytic converter that restricts exhaust flow before it reaches the turbine wheel. The Cobb uppipe removes both restrictions, improving exhaust gas flow to the turbine and reducing
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