no, I'm afraid you have not. You are confused, or have been mislead, or something.
The new 255hp engine in the E90 330i sedan isn't in the coupe (330Ci). The 330Ci still uses the older engine from the E46 cars that produced 225hp, with the exception of the performance package cars, which produce 235hp.
There will be a 255hp 330Ci within the next year, but all anyone has so much as seen so far is spypics. Nobody but BMW test drivers in Germany has driven a 255hp E90 330Ci.
If you do not believe me, check out BMW's website. Compare the power numbers of the 330Ci and the 330i.
www.bmwusa.com