Audi TTS (2016) is 5 mm (0.20 inch) wider and 332 kg (732 lbs) lighter than BMW 4 Series Gran Coupe (2018).
BMW 4 Series Gran Coupe (2018) is 447 mm (17.60 inch) longer, 48 mm (1.89 inch) higher and has 141 liters (4.98 ft3) bigger cargo space than Audi TTS (2016).
