I know its a little late in the game, but just so everyone knows what I went through. My clutch started slipping when i was driving to amarillo the other day from Houston, at 26k miles on the car it proceeded to completely fail about and hour later after i noticed the problem. I had my STI hauled to the Subaru dealership, they told me the warranty does not cover it, my extended warranty does not cover it. It is considered to be a part that is designed to wear out evidently. I just had APS 3.5 inch turboback exhaust installed and a front mount Perrin I/C installed. I cant think that either of these would cause a clutch to fail. After talking to the repair guy he told me that the clutch could last 120k miles or 20k miles, it just depends on how you drive it. I asked him about installing an aftermarket kit and he said he wouldnt recommend it. So to finish it off he did tell me the price for fixing it and its 1550.00 but that includes a new flywheel, evidently i destroyed mine, but I guess that beats a new transmission. By the way my STI was taken to Automax Subaru, in Norman Oklahoma.