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Originally Posted by Brad Roberts
Gilles,
You can do one better.. and get exactly what you want:
These 5 speeds are Audi/VW gearboxes. You can get something for around $500 with gear ratios better suited for track use or whatever and swap them in and out as needed. No need to stick with the Porsche 5 speed when the Audi/VW's have better ratio's in some of them. It took me over a year to locate the different tranny's and to learn what was available "stock" that would benefit my customers at the track 
Then I located a nice German fellow who imports used and new parts from Europe in 3 containers every 6 weeks I started buying air cooled engines from him 10 years ago and have maintained a good relationship with him. He specializes in European auctions and brings stuff over to sell Guess where I get Euro ratio'd tranny's when needed ?? LOL
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Brad, do you know why Porsche changed the 5-speed gearing to be longer in the 2.7L 986 models vs. the earlier 2.5L versions? With the shorter gearing in the 2.5L 986, even though it has 16 less hp than the 2.7L version, it can accelerate better to 60mph. Why didn't they just keep the shorter gearing of the 2.5? Just curious, as it seems ridiculous to increase the power, but then make it sprint slower. Granted the 0-100 and 60-100 times are faster in the 2.7, but still.
Performance between model yrs:
http://www.weissach.net/986-987_RoadTestSummary.html