Cusco LSD RS 2-Way(1.5&2) Rear Subaru 08-13 SH Forester EJ25T / 5AT

Cusco is well-known for making performance drivetrain components, especially for rally and track applications. This Rear LSD RS 2-Way differential is built for your 2008-2013 Subaru Forester with the EJ25T engine and 5-speed automatic transmission. A limited-slip differential, or LSD, helps put power down more evenly to both rear wheels, especially during cornering or when one wheel might lose traction. This unit is a 2-way type, meaning it engages both under acceleration and deceleration, which can improve stability and traction during spirited driving and cornering.

The RS designation in this differential refers to its specific internal design, which aims to offer a balance between aggressive locking action and smoother engagement. This particular model offers both 1.5-way and 2-way locking characteristics, selectable by adjusting the internal cam angles. This adjustability allows you to fine-tune how the differential behaves. For example, a 1.5-way setting will provide strong locking under acceleration but a milder lock under deceleration, which can feel more predictable for daily driving. Switching to the 2-way setting offers full locking under both acceleration and deceleration, providing maximum traction and stability during aggressive maneuvers like track driving or autocross. The unit is designed to fit directly into the factory differential housing, simplifying installation compared to some other aftermarket options.

When installing a limited-slip differential, it's important to use the correct differential fluid recommended by Cusco. This ensures the clutch plates inside the LSD operate smoothly and last as long as possible. Proper break-in procedures, as outlined by Cusco, are also crucial for the longevity of the unit. This differential is a significant upgrade for any Forester owner looking to improve their vehicle's handling and traction capabilities, especially if you plan on participating in performance driving events.