A lot of M3 owners - me included , think the susp is a little soft & can be improved. I would usually recommend converting to the same size tire frt & rear & adding the X brace as the 1st mods but if you are set on keeping the stock set up that's not an option. Get Eibach sport ( not race ) springs, Bilstein sports & the Eibach sways + the X brace from Eurasian 800 824-8814 for about $1200 ( that's what I paid). Skip the frt strut brace & add the rear brace after you have everything else done - I use the Korman part.