The 330i is about 1/2 second quicker to 60 than the 328i. I notice a significant difference. The throttle response of my 330i is more immediate that my 328i. However, the gap can be lessened by some aftermarket mods. I have installed a Conforti air intake systam and Borla full cat back high performance exhaust system in my 328i. These have improved performance. I will also add the Conforti shark injector - when it finally arrives. I conclude that these mods together will probably close about 1/2 of the gap in performance.