M4 joins Competition Sport line-up

Lighter, faster and more track-focused take on hot BMW coupé packs 543bhp

- CHARLIE MARTIN

BMW has revealed a more potent and track-focused version of the M4 coupé as the latest entrant into its motorsport-inspired CS lineage.

Following on from the Competition Sport versions of the M2, M3 and M5, the new M4 CS has more power, less weight and a reworked chassis set-up compared with the 'standard' M4 Competition, in a bid to improve its straight-line performance and on-the-limit handling.

It packs the upgraded version of the twin-turbo 3.0-litre straight six that featured in the limited-run M4 CSL, upping its peak power from 523bhp to 543bhp with an increase in turbo boost pressure from 1.7 to 2.1bar.

Although the CS doesn't produce any more torque than the Competition, it sustains its 479lb ft peak for an additional 220rpm at the top end of the rev range, holding it from 2750rpm to 5950rpm.