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Hey there Guys,
I have quite a bit of experience with both of these gearboxes, so I can answer some of the questions that have come up here.
The 5 speed would certainly work well for you. It is geared pretty low, but then so is the 6 speed. It is however far less durable than the 6 speed.
It really depends on which of the 6 speeds you decide to use though. There are two of them to chose from. The 986.20 and the 987.20 one is out the Boxster S and the other is out of the Cayman S.
If it was my build, I would try to find a good low mile G86.20, do the detent mod on it and rebuild it prior to installation. It is a very strong gearbox, and with the detent mod done along with the rebuild, it will be very durable. You will want to make sure to take care of the 1st and 2nd gear as much as possible, but 3rd -6th are pretty strong, and can be beat on without fear of breaking them. I would also recommend a good differential. My personal favorite is the OS Giken, but there are several out there to choose from.
Feel free to give me a call if you have more questions, I would be happy to discuss the pluses and minuses of your choices out there.
Erik Johnson
(970) 344-7761 phone
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