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The supra came with two automatics if I remember. The NA auto is an A340 and the TT auto is an A341 (correct me if I am wrong). I am pretty sure that with a higher stall A341 (auto TT trans) you will be able to stay around the 500-600 mark but I think it would be wise having the transmission built before trying to do so. Sound performance and boostlogic I think do transmission performance packages.