I can't believe I'm defending the five speed but here it goes. As long as you don't do any clutch drops the 5 speed can handle up to around 300hp. Doesn't have the detent problem the 6 speed has. Granted you're going with the 987 6 speed. I don't think those have detent problems but I'm not really involved in the 987 world much. The five speed is not only cheaper, so are the axles and I think the LSD. You'll also have to add in the cost of S rear uprights and brakes towards your swap. The 6 speed will be heavier and I wouldn't be surprised if it uses more horsepower. I hear the 5 speed is easy to rebuild if you choose that route. I personally would just buy another used one before I rebuilt a 2.7 five speed.
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Woody
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