This is aimed at you N57 manual drivers, so seeing as the 335d is only sold mated to the Steptronic, I am appealing to 330d 6MT drivers.
Basically; do you have a kickdown notch under your accelerator pedal just before it is fully depressed? There should be a little point of resistance just before its fully to the floor and obviously for the Steptronic cars, it will kickdown and go like hell, hence Steptronic.
I'm asking this for the reasons outlined in my linked thread below, because mine is missing! Even though its manual and shouldn't have one.
http://www.e90post.com/forums/showthread.php?t=667239