I'm going to put the 21" oem 215s on this spring, replacing the 18" 210s. I'm debating whether or not springs will still be necessary once I put these on. Thoughts? It doesn't have the sport suspension but I thought the 21s would help improve some of the boatish ness of the present setup.
2007 Imola Red Z4 M Coupe
2004 Navy Blue BMW 325Ci