I have a Quaife ATB in my new car, and I must say I was a bit sceptical at first (it came with the car) after reading up on how they work. However, having now raced it in anger, I must say I've been pleasantly surprised. In my car, which is live axle with 300+ in both power & torque, it seems well up to the job. Gives a nice progressive break away, good traction and I haven't noticed any spinning up of inside wheel. Not saying it's necessarily any better than a traditional plate diff - just that it doesn't seem any worse.
I should add that I haven't tried it in the wet yet, and that may be where it comes unstuck - excuse the pun!
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