BMW M surprises today with a Facebook post that talks about a V12 BMW Z3 Prototype. The one-off prototype joins others special M projects, like the V16 7 Series Goldfish, M8, E36 M3 Compact, E34 M5 Convertible or M3 Pickup.

No further information were released on the Facebook page, but we believe the V12 engine is the 5.4 liter M73 which produces 326 hp @ 5000 rpm, and 490 N-m (361 lb·ft) @ 3900 rpm.

With such a large engine packed into a small, compact package, it’s expected that the driving experience was from the historical 50-50 weight distribution that made BMW famous, so therefore the reasons for such model to not go into production are more than valid.