Is there any difference at all? My brother had a 02-03 (can't remember which year) M3 with SMG and I thought it was a blast to drive. How much does the M5 SMG differ from the M3 if any at all? Same mechanics and all i assume. Just gotta get used to all the modes it offers. Never really got into them on the M3. The only bad part of SMG is valet parking. Most people have no idea how to work it at first. But then again who wants to valet a car like this.