Kwiktsi,

Let me be the first to welcome you. For the most part everyone here are very cool, and open minded to new ideas. I myself am a tuner/Fabrication Designer. As far as I know there are know chips that will kill the traction control, but for the rev limiter. There are a couple of companies that re-map the mercedes ecu's. There is SuperChip, Upsolute, Renntech & Startech. The two techs are the most expensive of the bunch. They're around 1000.00 for about 10 Hp + you have to run 93 octane.
Other performance mods for the car is in suspension. You have Eibach, & H&R. Eibach has a sport package, if you kind find them, they also offer a sway bar for front and rear as well, as a Camber Kit.
H&R, has lowering Springs, Spacers and now have a coilover kit, for about 600.00-800.00 depending on were you go.
As far as Air Induction Goes, I myself have designed and manufactured a Dual Cold Air Induction System. Other then that K&N, offers a performance filter. GreenFilter USA, had a cone filter set up for it, that they borrowed from me. However, they pulled it from being produced. So the selection is very minimal unfortunately.
There are other misc. mods you can do, like door sills, dash kits and varies chrome pieces.
Oh ya I forgot. Brembo offers a Cross Drilled Rotor and steel Braided Brakeline for it.
That pretty much covers it. I know if I left anything out, one of the guys here will mention it.

So again welcome and congrats on the Car, I hope you enjoy it as much as we all here do.