 Some (but not all) of these features are available as options on the base model.A sports package is available on the GT, adding sport metallic pedals, QS4 19" machine-faced aluminum wheels, summer performance tires and a slightly smaller diameter, leather-wrapped Sport steering wheel.A G8 GXP version was shown at the New York International Auto Show in March 2008 with a 6.2-liter V8 from the Chevrolet Corvette and a six-speed manual transmission.