Subaru WRX Differential Lockdown System - Rear - Perrin Performance - `15-`21 is a rear differential lockdown designed to increase rear diff mounting rigidity and improve drivetrain feedback. This Perrin unit is intended for 2015–2021 WRX and STI platforms and was developed to reduce rear differential movement under load for a more connected driving feel.

The lockdown system secures the differential to the subframe to minimize flex and rotational movement that can soften throttle response and shift feel. By tightening the connection between the diff and chassis, the Perrin Rear Differential Lockdown helps deliver crisper throttle control and a firmer, more predictable rear end during spirited driving. The design focuses on fitment and durability while maintaining compatibility with factory components and common aftermarket setups.

Features

• Direct-fit design for 2015–2021 Subaru WRX and STI rear differential mounting points
• Reduces differential movement for improved drivetrain feedback and throttle response
• Precision components and supplied hardware for secure installation
• Compact, low-profile design that retains access to surrounding components

If you have questions about fitment, installation, or compatibility with other modifications please call us — we’re happy to help. We offer installation and customization services at both of our locations in Austin, Texas and the Los Angeles, California area. Call 512-982-9393 (TX) or 562-981-6800 (CA) for more information or to schedule service. If you are considering purchasing multiple items, contact us for possible shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov