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Heat the pulley to 275/300oF (135/150oC) in your kitchen oven or using a small propane torch and heat gun and the pulley will drop straight onto the crank
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Treat this as a replacement filter
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and use higher ethanol blends
ATI Performance Products Super Harmonic Damper Subaru WRX EJ20 EJ22 EJ25 Alfa Romeo Giulia Quadrifoglio Evolution Line Cat Back Heat the pulley to 275/300oFAIT Racing Super Harmonic Damper Subaru WRX EJ20 EJ22 EJ25 Unlike undampened underdrive pulleys, which offer no protection to high performance engines, the ATI Super Damper provides balanced dampening of torsional crankshaft vibrations at all RPM levels. The ATI Super Damper comes with laser etched timing marks and is a direct replacement for the OEM unit. The ATI Super Damper is a critical component for all high performance cars to help protect