Re: Are GTS\'s prone to leak when it rains???
We have seen enough Vipers, that I can honestly say this does happen at times, but mainly the front window. In all cases we caught it while the car was brand new and not delivered, or under warranty. It seemed to be caused by the bond between window glass , and the composite body, where the silicone(?) filler didn't seal properly --- or had a bubble in it. The only rear window leak we ever had , was caused by a plugged up drain hole in the back ( this could be your problem ). With a 2000, I see no reason this would not be covered under warranty.Hope this helps some, and I would get it fixed as soon as you can.
Best of Luck !