We Also needed toexchange the Torsen differential for something that could handle dragstrip abuse. We hadn't broken the Torsen with the many clutch drops that we had already performed, but we didn't want to take the chance of it happening at the track, so we ordered this Traction-Lok unit from FRPP. This particular unit, PN M-4204-F318C, is the same differential from the '03-'04 Cobras. It features carbon-fiber friction plates and is set up for 31-spline axles. We also used FRPP's installation kit (PN M-4210-A).