Either you installed them wrong, never actually set them or turned them on, or just have no sense of feeling for a mod like this. Throttle response is absolutely much faster and more snappy. I turn mine off in bad weather due to this just to avoid spinning tires. Either way, sorry for your bad experience because this mod really did make a difference in the drivability of my 4R
Very good video explaining. Agree. In my case the SB did nothing as I am able properly utilize full pedal travel based on the need. A person that uses mostly the first 50% of pedal travel may feel like they are driving a race car now with SB. The key is a proper seat position. I didn't not know that I was doing it wrong until took the BMW Driving School which completely change my driving style and eliminated many bad habits. BTW fully recommend the school