The 2.1-liter turbocharged inline-five engine helped Audi's rally dominance in the 1980s, sending the Audi S1 to victory at Pikes Peak international hill climb and powering the iconic Audi Sport ...

The Audi Quattro S1 was a 480 hp rally weapon. So a rally champion built a 650 hp Nissan Skyline 4WD to beat the Audi. This is the Super Skyline story ...