The torsen is a nice, smooth diff, I love my T2. At the track it's tough to find the spin/bog line with the bog usually winning. around corners though it definitely keeps the car going straight. For the amount of torque you've got though, I wouldn't launch it on slicks.
I'd take a look at ones like the ARB air locker, I think it is a pretty cool setup.
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393W: AFR 205's, hydraulic roller, TKO600.
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