Very low. The 99s that were defective failed pretty quickly and others were replaced just as quickly.
Of course, when you get your PPI at the Porsche dealer, you can check out the history of the car; the engine may have already been replaced.
Best of luck on the purchase.
PS-
If you have the funds, consider a 2000 Box S.
Worth the extra funds IMHO.
Threaded Mode
