Audi has developed its TT into a true Porsche baiter with its RS derivative, the most powerful version yet.

The range-topper has a 335bhp 2.5-litre turbocharged engine that propels it from standstill to 62mph in 4.6 seconds and on to 174mph.

It also has the looks and agile handling to match.

Quattro four-wheel drive, strong brakes and a slick six-speed manual gearbox will encourage and reward enthusiastic drivers and 18in alloys, a boot spoiler, unique colours and aluminium-finish mirrors make it stand out from its lesser TT siblings.

As a halo model, TT RS will remain a rare sight.

UK sales expectations are 400 units in 2010 – RS’s first full year on sale – split 80/20 between coupé and roadster.

Not all Audi dealerships will supply it. Buyers are expected to be mostly male, career focused and migrating from another sports car. Audi expects them to add £4-5,000 of options on average.

Price: £42,985 (coupé), £44,885 (roadster)

Rivals: Porsche Cayman S, Mercedes-Benz SLK55 AMG, Nissan 370Z