Audi R8 V10 GT Exhaust Valvetronic system 2012-2016The Audi R8 ST, with its v10 engine, aluminium monocoque spaceframe, and striking yet refined styling is a formidable supercar, yet still refined enough to be used as a daily driver. with this in mind the sound and performance criteria for the exhaust was clear, to sculpt an exhaust that would be comfortable at cruising speeds, yet raw and powerful in sound and nature in high revs.