2000 Boxster S. 87,000 miles, probably 4,000+ in track miles since the warranty expired and no extended warranty. RMS 3 times and replaced the tranny while under warranty at about 45,000 miles and both have been solid ever since (knock on wood). I drive the car very hard and don't do any special maintenance other than more frequent brake bleeding, checking wheel bolts for tightness, etc. I worry more about safety failures and keeping it on the track sunny side up but ahead of the GT3's
But if the engine fails, 3.4/3.6 conversion here I come.