Mazda MX-5 Miata Mazdaspeed Complete Report

The biggest change for the Miata since its 1989 inception came in mid-2004 with the introduction of the 178-hp, turbocharged Mazdaspeed MX-5. Speed now joins lively handling as part of the Miata's timeless appeal. The 1.8-liter four-cylinder engine makes peak horsepower at 6000 rpm, and 166 lb-ft of torque at 4500 rpm. That's 25 percent more horsepower and 33 percent more torque than the naturally aspirated Miata, which remains unchanged for 2005. A five-speed manual transmission is standard on base and LS Miatas, with an automatic available on both.

2008 BMW 320d Convertible

BMW introduces the most frugal Convertible in the 3 Series range, the 320d. Available in both SE and M Sport guises, the new 320d uses the same 1,995 cc engine from other 320d models in the 3 Series range to offer 177hp and 350Nm of torque.

This single-turbocharged two-litre diesel engine propels the BMW 320d Convertible from zero to 62mph in 8.6 seconds and on to a top speed of 139mph. EfficientDynamics plays a part in the car's performance with stop-start technology on manual cars, a second-generation common-rail injection engine, and a Diesel Particulate Filter fitted as standard. These technologies ensure that the new 320d Convertible is BMW's most frugal open-topped 3 Series, delivering an impressive 53.3mpg on the combined cycle and CO2 emissions of just 140g/km.