mdure

I just came back from getting a 2008 C280 Sport. I must say it is beautiful... When I test drove it it felt smooth, as i was chatting with the sales man of the dealership I didnt got the chance to push it to see performance stuff... like acceleration. Now I am reading everywhere much smaller BMW's are faster than my "new" car, I don't understand why with a V6 235hp it feels so heavy... what do you think?

Some questions for the experts:
1. The 2008 C280 = w204?
2. The engine is a 2.8 or 3.0 litter, I have read in some places that it is 2.8 in others 3.0, which one is right?
3. Is there a performance chip or repro that could get the best out of my engine??