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Change of rear axle ratio

Transmission

Vehicle Information: Year: 2001; Engine (type, size, modifications): 2.7 ; Total Mileage: 69,000;

I would like more torque around town in my Boxster with th 2.7 engine. I believe that it has a 3.55 rear axle ratio. My understanding is that there is a 3.88 gear from the 2.5 cars that may fit. Additionally the tiptronic cars have a 4.02. Is it possible to change to either one of these at a reasonable cost.

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