Cusco 6A1 541 AX Rear Cross Bar for 2015-2021 Subaru WRX STI AWD

Vehicle Fitment

• 2015-2021 Subaru WRX / Subaru WRX STI (VA chassis, AWD)

Features

• Rear strut tower cross brace to reinforce chassis rigidity
• 4-point bolt-in design for secure installation
• Oval-section high-rigidity bar improves rear end stiffness
• Reduces body flex during hard cornering and aggressive driving
• Enhances suspension geometry for more consistent handling
• Lightweight construction minimizes added mass
• Cusco blue finish resists corrosion and complements engine bay
• Improves overall handling response and vehicle feedback

Specifications

• Part Number: 6A1 541 AX
• Position: Rear chassis / strut tower brace
• Material: Aluminum center bar, steel end brackets
• Finish: Cusco blue corrosion-resistant coating
• Fitment Type: Bolt-on (may require minor interior trim modification)
• Drivetrain Compatibility: AWD
• Chassis: VA generation WRX & STI (2015-2021)
• Installation Tools: Standard hand tools (basic mechanical skills recommended)

Included Components

• 1x Cusco Rear Cross Bar (6A1 541 AX)
• 2x Mounting brackets
• 2x Stainless-steel mounting bolts
• 4x Washers
• 6x Nuts

Product Description

The Cusco 6A1 541 AX Rear Cross Bar is a performance-oriented chassis brace designed to stiffen the rear of the Subaru WRX and WRX STI (2015-2021). By tying the left and right rear strut towers together with a rigid oval-section bar, this brace reduces unwanted body flex that occurs under cornering loads. The result is improved handling precision, better suspension geometry retention, and more predictable vehicle feedback during spirited driving or track use.

Constructed with a lightweight aluminum center and durable steel end brackets finished in classic Cusco blue, the 6A1 541 AX is engineered for long-term durability without significant weight gain. It installs with a 4-point bolt-in design using basic hand tools, though minor trimming of interior panels may be required for fitment. This rear cross bar is ideal for enthusiasts looking to complement front strut braces or suspension upgrades, providing a more connected and confident driving experience.