After several customers have asked about waterpump failures on 996 and 997's I decided to do an experiment on my own 2008 GT3. The first hole drilled was the top one so coolant flow kept the chips out, then the next one down, and finally the lower most one. Tap the holes for 10X32 button head allen screws. cleaning, and installing with red loctite 271. Looks nice and clean. All this was done with engine in chassis. I've seen the results of this failure at MidOhio and Putnam Park. I was behind the one at MidOhio when it let loose.