Hey sveerara,
If you want to mod, you should really wander on over to Benzsport. Especially a "C". Just click the link in my sig. Lotsa C Class peeps over there can tell you lots about Renntech and Brabus (one of our sponsors is a certified Brabus dealer and gives some good deals).
There is lotsa knowlege in both forums, but I kinda use this one for more technical, OEM type, questions, and Benzsport for aftermaket tips and mods.
We seem to share a lot of members and that's cool. It's just that you may get a better response to this question over there and if your house is anything like mine, you have to make the most of your "computer time"
. Paul.