Additionally, BMW mounts the rear subframe directly to the body, with no rubber bushings. The M4 we drove is exactly 50 lbs lighter than the 2013 BMW M3 Lime Rock Park Edition we drove last November.

With a new 3-Series on the market for a little under a year now, and a new 4-Series coupe on the way, it's about time for BMW M to roll out the latest versions of its icons—the M3 and M4. We're ...