Nissan has taken the roof off its adrenaline-pumping 350Z, one of the sexiest cars to hit the road in recent years. Since it was launched in 2002, the Z has won critical acclaim and admirers aplenty with its combination of looks, drivability and power. It is now available with the top off. The roadster has an automatic fabric roof that folds under the boot in a respectable time of 20 seconds. Nissan has stiffened the 350z Roadster's undercarriage with a set of heavy-duty cross-frames to offset the structural rigidity lost through the absence of a fixed top. Additional reinforcements were added at the door openings and to the chassis. The roadster is fitted with the same 3.5-litre V6 engine used in the coupe. It produces 287bhp but Nissan claims it has tweaked the engine to sound more racy. The carmaker says driveability has been improved by the use of an electronically controlled throttle. The convertible was unveiled earlier this year at the Geneva Motor Show and is available in Europe and the United States. However, Hong Kong drivers face a long wait. Nissan's official dealer says it is receiving a lot of calls about the 350Z Roadster but it is unlikely to receive shipments until next year.