Ruf RT 12 Porsche (fastest-4)

The German carmaker Ruf is doing a lot more than copying Porsche models and shoving steroids up their throats. Over the years, it has imposed itself as a serious, hard-working official tuner, much like AMG is for Mercedes and M-Power for BMW. This model also has a 200 mph (320 km/h) top speed, but a slightly improved acceleration, of 4.6 seconds from 0 to 60