Originally Posted by Crux

My first track event with the new differential was this past weekend at Summit Point. At first, I thought the differential was going to be too much. I thought I was going to be sideways for most of the course. I couldn't be more wrong.

The differential was predictable and I felt a level of control over the car I didn't think was possible. Instant power delivery, facilitated throttle steering, consistent power delivery over the hairiest of bumps/uneven asphalt, and it felt like it kept me going straight in threshold braking (occasionally it felt like the rear wanted to step out, but the slightest of counter-steering settled everything instantly). The cusco 1.5 way RS is a good choice if you're looking for a differential for track use

YMMV, but my setup includes: bridgestone RE-11's 265f and 305r, powertrix coils, solid engine/trans/diff bushings, and some aero modifications.