I have taken about 1.5 inches away from the rear bumper, and made some changes to the shape of it - the rear bumper does not catch even with the stereo in the car - which lowered the back by around another 3/4".
30mm lowering the car does not seem to give any real problems on the cars we have done - on the standard car even very steep slopes such as those in multi storey car parks don't give a problem. |