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Reading in the Supra forums, the R154 is said to be good for 700hp and 500-550 torque before problems occur, and this can be minimized by replacing a thrust washer. Beyond this and they recommend the 160/161.
Our little flat fours are not torque monsters. I bet the R154 would be pretty indestructable hooked up to one of our 86's.
Realistically, the FA20, even in big-power form, won't be hitting those numbers, for the most part. Those that go really crazy already have the cheddar to go for the 160 trans and 8.8 diff.
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