The fastest BMW by top speed is commonly cited as the BMW M4 CSL , with a top speed of 191 mph in one recent ranking, while some sources also list the BMW M5 CS as the fastest BMW they’ve tested overall because of its extreme acceleration and 10.7-second quarter mile.

Quick Scoop

If you mean top speed , the M4 CSL is the standout from the sources I found.

If you mean straight-line speed / acceleration , the M5 CS gets a lot of attention as the quickest BMW in testing.

What to know

  • BMW M4 CSL : 191 mph top speed.
  • BMW M5 CS : fastest BMW in MotorTrend’s testing, with a 10.7-second quarter mile at 129.7 mph.
  • BMW M5 CS also appears in other rankings as the current fastest street-legal BMW, with a quoted 0–60 mph time of 2.9 seconds and a 190 mph top speed.

Bottom line

If you’re asking “what is the fastest BMW?” the safest short answer is: BMW M4 CSL for top speed, and BMW M5 CS for outright performance/acceleration.