I can provide MHO... for what it's worth. I just sold my 02 330i and have had my 03 330i PP for about 2 months. The revised gearing in the PP make a pretty big differance in acceleration. I would say the car is easily the .5 second faster (5.9 vs 6.4) in 0-60 times tha BMW advertises. I also believe that the new cams do make a small differance in the top end acceleration. The motor doesn't seem to run out of steam as soon. Just my .02cents!