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It is unlikely that anybody has ever accused the Audi R8 GT of being a slow car, but like everything else on display at the SEMA Show – where the unofficial motto should be "if there's a will, there's a way" – Underground Racing has proven that fast can also get faster. Starting life as a 560-horsepower R8 GT, Underground Racing has developed four stages for the car ranging from a "mild" 700 hp up to a ridiculously wild 1,000-hp version... and that's just on pump gas.