transmission coolers are also standard issue on spec racers - the small 5-speeds need all the help they can get. the caymans often also need tranny coolers at the track - again, a smaller, lighter unit than the 986 6-speeds so need other ways to ditch heat. LSDs are also a big heat maker.
Transmission Gearbox Oil Cooler System - 996 - 997 Trans By Patrick Motorsports Porsche & Mid Engine Performance Specialists