The Porsche Mezger engine will go down in history as an engineering marvel for sure. It has been updated and upgraded as close to perfection as almost possible. The last iteration, referred to as the GT1 motor, was used in the 996 and 997 Turbo and GT3 cars as a watercooled powerplant.
Every Porsche model iteration has had its own weak points. Chain tensioners on the older air-cooled cars, water pumps on the 944, coolant pipes on the early Cayennes, etc, etc, etc... If the benefits outweigh the costs, you fix it and enjoy the experience. The 996/997 GT3 and Turbos have coolant pipe issues and the benefits of a solid repair outweigh the cost by an order of magnitude!
Below is a quick little overview of what the coolant pipe repair takes. There are multiple methods (welding, glueing, and pinning) for fixing the issue. Our method of choice is called "pinning" or "staking." It involves drilling and tapping each fitting for a stainless steel M4 bolt to relieve the tension stress imparted on the joint. The factory sealant works great for keeping the coolant inside of the engine, it just needs a little help to keep everything in the correct place.
If you own one of these amazing vehicles, and have any questions, give us a call and we will be glad to talk you through the details! 321-806-8664