NEW versions of the Audi S5 Coupe and Sportback with an uprated V6 diesel engine and mild hybrid technology will go on sale before the end of the year.

The three-litre turbocharged TDI engine is the most powerful version in the Audi V6 diesel engine line-up and produces 342bhp with up to 516.3lb-ft of torque between 2,500 and 3,100 rpm. Acceleration to 62mph in the S5 Coupé takes 4.8 seconds and 4.9 seconds in the S5 Sportback, with both reaching their peak at an electronically limited 155mph.

Audi claims that the mild hybrid system which is integrated into a new 48-volt electrical system along with an electrically powered compressor, has the potential to significantly reduce fuel consumption.

Both cars will come with an eight-speed Tiptronic gearbox, quattro permanent four wheel drive and sports suspension.