I have been to two.
1.) First, I went all the way down to Mckenna inDowney because they were the only certified Porsche collision repair center in So Cal. I highly recommend their work as it was perfect. The only issue I had was that they took a while to repair the car; however, in my case, it didn't matter how long the car was in the shop as the other insurance paid for my loaner car.
European Collision Center | Audi, BMW, Porsche and Volkswagen
2.) I was rear ended in a very minor accident; however, it only required a new rear bumper (no mechanical damage). As a result, I decided that was the time to put on an aftermarket bumper that I had been looking at. The McKenna body shop above is not allowed to put any aftermarket items on the car due to their Porsche certification, so I decided to try LA Car Guy in Santa Monica. They are Audi certified, which to me seems like the next closest to Porsche certified. They put the aftermarket bumper on and it looks great. There are minor fitment issues from the bumper itself, but they added extra reinforcements and went above and beyond what other shops may have done. They were VERY accommodating while waiting for the new bumper to be made and arrive.
Body Shop Santa Monica at LAcarGUY Body Shop
In the future, I am going to try Platinum Motorsport for any aftermarket modifications. It is right down the street from me, and I have personally seen plenty of amazing custom jobs that they have done. They recently did a complete body kit with matte black paint on a Carrera GT and a Bugatti Veyron.
PM | Platinum Motorsport