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Balanced piston
Increases in horsepower are a simple easy install away
Downpipe options are available to bolt to the stock o2 housing or to bolt to a stock-location aftermarket 2
Inlet and Outlet V-Band Clamps
Fluidampr Harmonic Balancer Crank Pulley for EJ WRX/STi (531101) GSC Balanced pistonFluidampr harmonic balancer crankshaft pulley for the EJ20 EJ25 Subaru WRX and STi models. This balancer helps to reduce destructive crankshaft torsional vibration lessening the wear on critical internal engine components. Vehicle Fitment: EJ20 EJ25 2002 2014 Subaru WRX 2004 2020 Subaru STi Part Number: 531101 OD: 5 3 8" Bore Diameter: 0. 9436" Length: 1. 927" Weight: 6. 9 pounds Rotating Weight: 4. 6 pounds Finish: Black Zinc More Info: Normal stock
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