2010 Audi TT

The 2010 Audi TT RS's approach to engineering is highly sophisticated, albeit very different from the Porsche's -- front versus mid engine, five-cylinder turbo versus flat six, largely aluminum body versus steel, electronically controlled AWD versus RWD.

It's the turbo five-cylinder that's the new and intriguing part for the RS version of the TT, which first came with a four-cylinder turbo and a V-6. Then the sporty 2010 TT S eschewed a V-6 in favor of a highly pressurized turbo four, in order to keep the weight down. For the Audi TT RS, low weight again is a priority, so again there's no V-6.

Instead we have a new transverse 2.5-liter turbo five. Featuring direct gas injection and 1.2 bar of boost, it kicks out 340 horsepower. Its torque plateau runs from 1600 rpm to beyond 5000 (albeit with a bit of lag below 2500-ish), which gives it an easy-driving mid-range muscle.

Its turbocharged 2.5-liter engine derived from the motor used in US versions of the Rabbit and Jetta 2.5 produces well over 300hp. It also delivers explosive acceleration, driving delight, and unrivalled sound.

Powerful five-cylinder engines have a long legacy at Audi, made notorious by the ur quattro and the Group B rally cars it spawned. The turbocharged, direct-fuel-injection engine in the 2010 Audi TT RS is the new face of this dynamic tradition. It enables the Audi TT RS to perform extraordinary feats. For example, it reach 62mph in less than 5sec; overtaking is child's play; and top speed is limited to 155mph.

The quattro permanent all-wheel drive system, a sophisticated chassis and stupendous brakes keep a tight rein on the power. All in all, the compact 2010 Audi TT RS - with its lightweight and largely aluminum body constructed on the Audi Space Frame principle - is a driving machine to be reckoned with. The car will be available in Coupe and Cabriolet versions.