This is a one-off BMW M5 with close to 600bhp. Built to commemorate the 25th anniversary of BMW’s iconic M5 super-saloon, it’s a stripped-out lightweight special that shows what M Division could have done if it hadn’t built the X5 M and X6 M. Details, quickly please! I’m slobbering over this new BMW M5 already! Let’s start with the engine. As if the 500bhp/384lb ft 5.0-litre V10 wasn’t