Acura RLX (2015) is 156 mm (6.14 inch) longer and 61 mm (2.40 inch) wider than BMW 3 Series Gran Turismo (2021).
BMW 3 Series Gran Turismo (2021) is 44 mm (1.73 inch) higher, 204 kg (450 lbs) lighter and has 99 liters (3.50 ft3) bigger cargo space than Acura RLX (2015).