If your engine will have 475-500 bhp, I suggest budgeting an extra (?)$3000 for a 3.73:1 ring/pinion in the ZF. If you have a healthy sense of self-preservation, that should help keep the rev limit down in the torque band, at least in 5th gear! It should also help lengthen rear tire life. I'm told this makes the car less jerky in the lower gears, too.
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