When McLaren's engineers set out to develop the McLaren 12C Spider and its distinctive retractable roof, they set aggressive performance targets: benchmarks that, at the time, seemed unachievable. 

Through tireless innovation, the team shaved 10 kg (22 lbs) off their original target weight for the roof, reduced the drag caused by top-down driving, and even ensured that the spectacular engine was still visible with the roof down.