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.Underground Racing, known for tuning just about any rear-engine supercar , says that the Stage 1 kit is good for 700 hp through the automaker's Quattro all-wheel-drive system on premium gas and 1,000 hp running on race fuel. Stepping up to the Stage 2 kit will drop 850 hp from the pump and 1,200 hp on race fuel. Both the Stage 3 and Race Version kits are rated at 1,000 hp on 93 octane, but while the Stage 3 tops out at 1,200 hp, the Race Version can lay down up to 1,500 hp.On display at the Nitto Tire booth, the Underground Racing R8 GT Stage 3 came in a beautiful matte red hue with black 19-inch HRE performance wheels wrapped in Nitto Invo tires. No word on pricing for any of the Stage kits, but we're sure if you can afford a $200,000 (base) R8 GT, a little extra isn't going to break your bank.