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It depends what kind of racing you're doing, IMO. I've driven quite a few of both types, in various cars and they all have their strong points. Road-racing with a Torsen is a delight though, which is why I put the T2 in my IS.
Torsens are great OEM LSD's, they're quiet and feature very smooth engagement. Especially for a Lexus, etc. they're perfect. I think most Toyota/Scion owners would appreciate that. Anyone else would likely want a differential with much more lockup, and would probably not care much for a smooth OEM-style clutch-type LSD anyway, and would look aftermarket anyways.
I've got a TRD 2-way for my AE86, it's going to depend on what you want to do with this car, but with it being an existing Toyota differential, options will be relatively plentiful. I'm sure the A70 Supra guys are liking the fact that new options may soon exist for their cars as well.
Jeff
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2011 Lexus IS350 F-Sport 6MT with LSD
1986 Toyota Corolla GT-S Supercharged
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