Spy shots of the next-generation BMW Z4 show that the popular convertible will get a folding metal roof in its next incarnation.

Although the car was spotted in heavily-disguised form during tests, the pictures show that the car will not only get a retractable steel roof but a more muscular look as well.

It is expected that the 2009 Z4 will feature a new range of powerful engines including the twin-turbocharged 3.0-litre straight six-cylinder unit.

There's even the possibility that the Z4 will be available with diesel power for the first time, too. A flagship M model could get the new 4.0-litre V8 from the M3 - although a broad line-up of four-cylinder and normally-aspirated six-cylinder petrol powerplants will continue to be offered.

All cars will use BMW's fuel saving/CO2-busting Efficient Dynamics system that includes regenerative braking, low resistance tyres and stop/start technology that cuts the engine when the car's at a standstill.

As well as new engines in the range, the Z4 will also gain the new double clutch gearbox that has recently made its debut on the M3, which offers significant performance gains as well as lower fuel bills.
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