PPI Razor GTR: Supercharged Audi R8 with 580HP to Debut in Essen If you’re searching for one of the most extreme Audi R8s around, then look no further than to PPI Automotive. The German tuner has announced that it will unveil the production version of last year’s wild R8 RAZOR concept at the upcoming Essen Motorshow (29 November to 7 December). The Audi specialist turned its focus on increasing