Six things to know about the new BMW Concept M4 GTS

  The BMW Concept M4 GTS  is being unveiled at the Pebble Beach Concours later this week writes Geraldine Herbert 1) It’s an M4 on steroids, with more power (estimated at 460bhp) a stiffer suspension and weight loss all consipire to transform the M4 from a road machine into a track focused road car. 2) There is nothing understated about it; the matte dark grey trimmed with an acid orange metallic paint is one to get you noticed....