2023 BMW M4 CSL spy shots: Hardcore M4 coupe in the works

The current BMW M4 coupe (and M3 sedan) only arrived on the scene a year ago but a hotter version is out testing. The M4 is currently available in base and Competition grades. Previously thought to be for the next rung up the ladder, the CS, the prototypes you see here a more likely to be for a modern CSL, according to sources. Former BMW M...