From 2004 the S4 cabrio was on a new platform and had the great 4.2-litre V8 under the bonnet, with 339bhp pouring through the Quattro four-wheel drive system. Top speed is limited to 155mph and the 0-60mph is despatched in 5.9sec, a result of relatively small size car and big grunt motor.
Build quality is exemplary so even if the odometer is on the second revolution, don’t necessarily be put off, these things eat miles. Buy carefully, bearing in mind that tyres and brakes will have been under some strain, and you’ll be buying a wonderful car.