If you've always been a bit smitten by BMW's multi-hued art cars, then there's a good chance you'll be equally taken by its latest M4.

The BMW M4 DTM Champion Edition - so named because BMW took the DTM championship honours at the weekend - is a rather unsubtle and very limited edition of the M4 coupe.

Just 23 will be made and the number 23 is daubed on its doors. Why the significance? It's the racing number of Marco Wittman, who took championship honours.

All DTM editions will be painted Alpine White, with matt black bonnets and boot lids wearing rainbow stripes. There's Stabilo Highlighter Orange for the kidney grille surrounds and black racing stripes along the M4's sides, as well as carbonfibre detailing for the mirrors, spoiler and diffuser.

It all echoes the livery of Wittman's car quite nicely, though with no mechanical enhancements touted, it seems the M4's 425bhp twin-turbo straight-six engine and rear-drive chassis haven't been touched. That's no bad thing, however.

And what of BMW's victory? Well, the drivers' trophy returns to the company after Audi's Mike Rockenfeller nabbed it last year. And Wittman's reward for reclaiming it is pretty special: he's been hooked up with a test of Toro Rosso's F1 car. Lucky feller...