The 1.5-Way Rear LSD will improve the cornering acceleration abilities in the Subaru STI.

Cusco RS Rear LSD 1.5 Way (R180)

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Specs:

• 1.5 Way (R180) rear limited-slip differential
• High-tension chrome-molybdenum steel housing and gears
• Large oil windows for increased flow
• Cusco's original groove cut technology for improved efficiency on the clutch plates
• Promotes stability and longevity
• Utilizes coil springs located between the pressure rings to develop initial torque and features full engagement during acceleration and partially under deceleration
• The use of coil springs rather than cone plates helps promote faster, smoother engagement, along with higher durability
• Can be converted to a 2 way LSD as well
• Can also be changed into a 2 way by rotating the center spline to engage on acceleration and deceleration
• Completely customizable with different clutch pack orders and spring tension preset, allows them to be set up to an exact preference of the end-user

Cusco RS Rear LSD 1.5 Way (R180)

The 1.5-way LSD is a great way to improve the performance and handling of your vehicle. The 1.5-way means that both rear wheels will spin under acceleration, and one wheel will have engagement under deceleration. Cusco has developed their 1.5-way differential using high-tension steel gears with high-efficient clutch plates. And for your convenience, it can be converted into a 2-way to have the rear wheels engaged under acceleration, deceleration, and braking.

This is a great upgrade for those of you with track-dedicated race cars, rally cars, or street-driven vehicles that enjoy the occasional autocross or weekend track event.