King SI-Series Main Bearings (Set of 5) Subaru WRX 2002-2014 / STI 2004-2021 EJ20/EJ22/EJ25 (Including Turbo) NGK Plugs The drilled holes provide a

The drilled holes provide a better cooling effect from the heat produced during braking

ISR Solid Steering Shaft Bushing replaces the stock rubber piece and can improve steering turning and steering response

Works with the two OEM Subaru pulleys

Part #: WS02-XS-HYB (Supersedes WS-HYB)

Whether you're restoring an iconic R34 GT-R

King SI-Series Main Bearings (Set of 5) Subaru WRX 2002-2014 / STI 2004-2021 EJ20/EJ22/EJ25 (Including Turbo) NGK Plugs The drilled holes provide aPart #: MB5382SI King SI Series main bearings are replacement bearings designed for performance engines with a factory crankshaft. The bearings have an improved crankshaft finish for reducing microscopic ferrite peaks on improperly ground or polished nodular cast iron crankshafts. King SI Series main bearings feature improved oil clearance to reduce wear and increase engine life, which in turn reduces operating noise, vibration, and excess oil flow.