Bumblebee has lost its top.GM’s fifth-generation Camaro, famous for its starring role in the 'Transformers' movie series, has just become even cooler.Images and details of GM’s latest soft-top have been leaked ahead of the Camaro convertible’s Los Angeles auto show debut on Thursday. BETTER THAN A BMW?Shadowing its fixed-roof sibling in terms of drivetrain specification, the Camaro convertible will feature both 3.6 V6 and 6.2 V8 power.The V6 is good for 229kW, the V8 either 313kW (mated to a six-speed manual transmission) or 294kW in autoc trim. Contrasting the palette of nine surface colours, Camaro’s canvas roofs are only offered in black or tan and retract in 20 seconds. Structurally, GM’s engineers have made four strategic reinforcements to ensure the convertible does not suffer alarmingly from scuttle shake.DIFFICULT PATHBraces above and beneath the transmission tunnel, between the front suspension tower strut tops and under the centre floor structure render a level of torsional stiffness GM says is superior to BMW’s 3 Series convertible, which is quite a claim. ENGINE CHOICE: A V6 or a V8 - but who cares if your car looks this good? The Camaro convertible’s chief engineer, Al Oppenheimer, dedicated his design to ensure a comparable level of dynamic fluidity to the coupe."We took the more difficult, but better, path of bolstering structure rather than softening the suspension. We didn't change a strut, bushing or spring rate from the Camaro coupe."Due to go sale in February 2011 across North America, the Camaro convertible should enable GM to further swell its superior sales numbers over the sworn enemy – Ford’s Mustang.