BMW 4 Series (2015) is 320 mm (12.60 inch) longer, 70 mm (2.76 inch) wider, 90 mm (3.54 inch) higher and has 283 liters (9.99 ft3) bigger cargo space than Porsche Cayman (2019).
Porsche Cayman (2019) is 180 kg (397 lbs) lighter than BMW 4 Series (2015).
