Guys, The performance box is just a waste on money!!!!! I smoked a GT2 by a car length and slowly walking away!!! RC tested the Ruf TUrbo and almost was neck to neck with the GT2 with a slight advantage for the Turbo, i smoked a 620hp m6 that runs beside the GT2's tail all day long!! i just tryed yesterday with a stock tt with a full tank of gas and gave him 3 cars lengths in 700 meters and he had the advantage cuz he slammed the gas before me!! im going to test with a 997tt with the evo 610 package these days and will give u the results!!! and a video if the owner agrees!!