The M4 got 3:00.X lap time at VIR (Virginia International Raceway) in the 8th edition of the C&D Lightning Lap.
To put in context this is ~5 seconds faster than the e92 M3. However the base corvette stingray got 2:53 so significantly faster. The Z/28 got 2:50 I believe which is about what the GTR Nismo got. Porsche 918 set the all time record at 2:43.