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An engine with a 4340 billet steel crankshaft will rev faster and cleaner due to the different harmonics produced from the high grade material
straight from Subaru
Fits Vehicles With or WITHOUT Active Valve Exhaust
2015+ Subaru WRX STI
Hardrace Front Lower Rear Curved Arm Bushing End Links An engine with a 4340Harden rubber bushings are made of high strength and anti crack rubber materials to offer solid handling response and resistance to unwanted suspension movement during hard acceleration, braking and cornering. . Improve handling response . OEM direct replacement . Regular greasing not required . No noise or squeaks Notes: 2PCS SET Hardened Rubber Equipped