The 2010 Ford Mustang Shelby GT500 is already quite an impressive machine, having many fans both in its native North America and in other continents like Europe. But Karl Geiger, the boss of Geiger Cars tuning company took his passion for the model much further than most guys. Not content with the 550 HP the 5.4-liter V8 produced in stock form, Geiger… …read the full post