Top Speed increase for the Audi RS4Wondering how fast your precious Audi RS4 could go without that darned electronic speed limit that the Germans impose? Is a 250 km/h top speed not enough for you? Well, no problem with that as the German car specialist ABT just came out with a solution that’ll get rid of your problems. With the help of ABT, the potential top speed of 420 hp V8 RS4 from 
