SuperPro's ALOY0017K offers a comprehensive DIY performance upgrade for your2015-2021 Subaru WRX or WRX STI Featuring pre-installed SuperPro bushings in the forward position of the arm and SuperPro's caster offset DuroBall bushing assembly at the rear the kit allows a bolt-on alloy arm, upgraded bushings and optimized geometry with additional caster and anti-lift geometry. The alloy arm brings strength, rigidity and a small weight savings relative to the OE steel arms. The geometry upgrades offer improved tire contact patch at the front end when accelerating, cornering and braking - working the tire more effectively and efficiently to generate greater grip and traction. The kit also includes new OEM style ball joint bosses to facilitate an easier installation (the OEM pieces often seize onto the OEM ball joints on the OEM arms). Factory Fit - SuperPro Alloy control arms enhance performance and handling, but also provide an quick and significant upgrade whether you DIY or have them installed by your SuperPro Authorized Dealer. Lighter, stronger, faster - these words form the foundation of SuperPro's alloy control arm range. Reduce weight, increase strength, and optimize geometry for improved grip, handing and feedback. SuperPro 2015 Subaru WRX Limited Front Lower Alloy Control Arm Kit (+Caster). Control Arm Lower - Arm Assembly. Alloy LCA Set

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