McLaren 570S (2018) is 152 mm (5.98 inch) longer, 130 mm (5.12 inch) wider, 49 kg (108 lbs) lighter and has 58 liters (2.05 ft3) bigger cargo space than Porsche Cayman (2015).
Porsche Cayman (2015) is 91 mm (3.58 inch) higher than McLaren 570S (2018).
