on a 99 boxter will a 5 and 6 speed bolt up the same to a 986

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If I remember correctly, on M96 motors, the bolt pattern is different, but both will bolt up.

- Nick

Yes, both the five and six speed will bolt up, although the clutch splines are different. But once that is done, you get into the real meat for changing a five speed over to a six; the half shafts are different, as are the six speed rear carriers, e-brakes, etc.