Alfa Romeo 4C (2015) is 7 mm (0.28 inch) wider and 511 kg (1,127 lbs) lighter than Toyota GR Supra (2018).
Toyota GR Supra (2018) is 390 mm (15.35 inch) longer, 108 mm (4.25 inch) higher and has 75 liters (2.65 ft3) bigger cargo space than Alfa Romeo 4C (2015).