I don't really notice any with mine...but also have to take into account my obnoxiously large cam I have. (IS3)

The GF's GTP has them as well, you can feel it at idle when in drive siting still at a red light for example. Putting it in neutral solves the problem. In park, letting it warm up in the morning, not so much. Driving, only thing you feel is some vibration in the gas pedal.

Worth it...to me, every penny, I love them. She could care less. LOL

~F~