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It was an option on the N/A, and from what I remember the gearing is really short in it. I have the TT LSD in my car and it works great though. You don't want one too short or you may have to make an extra shift in the 1/4 (depending of course on how fast your car will MPH in the quarter).
I would imagine finding a Supra N/A LSD used or in a salvage yard would be tough to do!