I need to know what suspension differences there are, if any, between a 97-98 BMW M3 Sedan and a 1997 BMW 328i. By all pracitcal and logical reasoning I can't think of any. I just don't want to tear my car apart and find out I'm wrong. The guy I bought these springs from say they will work, but I need some more opinions from people who know more than I do. Thanks.