[eschaider]

There is a predisposition for Cobras with high-powered engines to experience the back end to 'stepping out' as you say, that is inherent in the powerful engine, light car design model that the Cobra employs and we have accentuated. It is caused by the light car and a big engine that either tries to provide too much deceleration when you lift, downshift to decelerate or too much torque for the available rear tire normal force when you stand on it. Nothing can significantly change that attribute without reducing engine power. A torque biasing differential will mitigate the phenomena; however, it will not eliminate it.

You will notice a positive difference in how the car handles with a Torque Biasing differential, but you will not eliminate the rear end's predisposition to be squirrely.