Our test M4 Competition convertible blasted to 60 mph in 3.2 seconds before crossing the quarter mile in 11.3 seconds with a trap speed of 122.8 mph.

Although the Atom 4R is marginally quicker in the quarter- and half-mile showdowns, its top speed is 10 miles per hour lower than that of the M4 Competition ...

The ultra-exclusive, V-8-powered roadster was spotted carving through the Nürburgring during a recent test session.