I just had my 2001 911 serviced. (Oil, Transmission service, new belts pulleys and tensioners) I have had a problem with a fluctuating idle which was not due to a vacuum leak. I replaced the Alternator myself but the problem still persisted. Shawn and the mechanics took the time to go through the electrical system and after that checked out ok they changed the Alternator. That solved the problem. I. Could not be happier With the work performed and for there tireless efforts in sorting out this annoying problem. My car is getting on now in age but Renn-Haus treated it as if it was a much more expensive model. All in all. I don’t think you can go wrong if you want great service at a decent price. I would not think of going anywhere else to have my car serviced. Thanks again to the whole team from the nice lady at the front desk, Shawn the service manager and the technicians.