The folks at German Sport really know about Porsches. This is the only shop that asked me about the rear center carrier bearing on my 2004 Porsche 911. This is a well know problem in the 996 Porsche series. I just had them do the 90K service on my 2004 Porsche 911 and they did great. The cost was reasonable (well below dealer) and they fixed a few things that a dealer might have missed. I highly recommend them as your alternative to the Porsche dealer.