My feel on the general concensus is that sway bars do not fatigue and wear out. I think you'll be fine in the rear with the bar that you have now. The sway bar bushings may be another matter though. You certainly may want to refresh those, but not the bar.
I agree that the front bar seems to be more critical than the rear. Go check out the Boxster Spec board at www.boxsterspec.com. They've often discussed the best bar setup for racing and autocross. It seems that just recently I read about some folks doing SCCA autocross very successfully with just the stock or M030 bars in the rear. However, almost everyone switches the front to the GT3 bar.
I've personally got the GT3 in the front and stock S bar in the rear and the car feels very neutral. I want some adjustability to play with, so I'm planning to go to Tarett in the rear, but given how well balanced it is right now I'm in no hurry.
Kirk
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2000 Boxster S - Gemballa body kit, GT3 front bumper, JRZ coilovers, lower stress bars
2003 911 Carrera 4S - TechArt body kit, TechArt coilovers, HRE wheels
1986 911 Carrera Targa - 3.2L, Euro pistons, 964 cams, steel slant nose widebody
1975 911S Targa - undergoing a full restoration and engine rebuild
Also In The Garage - '66 912, '69 912, '72 914 Chalon wide body, '73 914
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