Greetings, new member here. I have a non-sport 2004 530i and am considering springs and shocks, and would appreciate any input on this decision. The car has just over 30K miles on it. My reasons for this are twofold: 1) I drove a 2007 550i sport/perf package and was amazed at how tight and responsive it was, and 2) I would like to have a more aggressive stance, fill the wheel-wells more, and have (something approaching) the responsiveness I felt in the 550i. But, I live in Minnesota, and the roads here are not the best around. I am a bit concerned that the ride will be harsh, but I am willing to live with that, unless others can chime in an dissuade me. Also, I am considering spacers on the rear hubs to help push out the rear wheels a bit/fill the wells. When I bought my 166s, I did not specify the M6-offset, which I suppose would have made this moot. Would the use of spacers harm the vehicle/ride in any way? Does anyone know the appropriate size spacers to do this (e.g., 20 mm)? Thanks.