Cusco LSD MZ 1.5 Rear GDA Impreza BR9 BM9 BP5 SH5 SHB

This is the Cusco MZ 1.5-way limited slip differential (LSD) specifically for the 2001-2007 Subaru Impreza. If you're looking to put more power down, especially when cornering or accelerating out of turns, an LSD is a major upgrade over the factory open differential. This unit is designed to send torque to both rear wheels, but it does so in a way that allows for a good balance between traction and handling characteristics.

The 'MZ' designation in Cusco's lineup typically refers to their clutch-type LSDs, and the '1.5-way' means it engages on both acceleration and deceleration, but with a stronger bias on acceleration. This setup is popular because it provides excellent traction when you're on the throttle, helping to prevent wheelspin and keep you moving forward. When you lift off the gas or brake, it still offers some locking action, which can help stabilize the rear end during corner entry. The internal components are well-made, designed to handle the stresses of spirited driving and track use. Installation involves removing the rear differential and replacing the factory unit with this Cusco LSD, which requires careful setup and gear oil.

This differential is a significant upgrade for Impreza owners who want to improve their car's performance, whether for autocross, track days, or just more confident driving on spirited roads. It's a well-known part in the Subaru community for its effectiveness and durability. Make sure to use the correct differential fluid as recommended by Cusco for optimal performance and longevity.