Stage 1 vehicles also have a performance exhaust system, while Stage 2 cars get all of the above plus a set of five-spoke 20-inch Quicksilver wheels and Cooper RS3 performance tires . ( The rolling stock is available as an upgrade on the other two models . ) Optional on all are a hood scoop, window scoops, billet pedals, a ball shifter, Roush gauges, and Roush doorsill plates.
