Volkswagen says the Golf R400 reaches 62 mph from standstill in a sizzling 3.9 seconds, 1.0 seconds faster than the German carmaker quotes for the Golf R and 0.7 second faster than Mercedes-Benz claims for the A45 AMG. Top speed is limited to 174 mph -- 19 mph over the electronically limited 155 mph maximum of the Golf R and A45 AMG, although officials suggest the gearing would allow it to crack 190 mph without electronic intervention.who and what?