I took my car here to have the left rear catalytic converter replaced. I was charged $635 and thought I was getting a deal since the dealership said it would be about $900 for them to do. Since then I've had the right rear converter replaced, which only cost $300! The muffler shop I went to this time (in California) told me I had an after market FRONT catalytic converter in the left rear. I called Frank's Mercedes Service to tell them of the situation, only to find out that they "purge" records. I DO NOT recommend for anyone to take their car here, and will think about changing my review, only if they make it right.