You may want to try Autobahn Designs in Riverside CA. I'm not sure where in the area your coming from, if you're closer to LA you have many options. Brabus in Newport Beach directed me to ABD to have one of their mufflers installed on my 98 C class. They are a well known VW tuner but they do work (non mechanical) on Mercedes. They do all kinds of custom work on old and new VWs, so they may be able to help you out. They told me they can do just about any cosmetic work on a MB. They are located about a block away from Walters Mercedes in Riverside and have very reasonable labor rates. They charged me $50 to install the Brabus muffler. You may want to give them a call and see if they can help you out. Here is their web address http://www.abdracing.com/ .

I hope this was some help

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98 C230
w/17'AMG MonoBlocks
Eibach suspention
Brabus Exhaust