Audi TT RS (2018) is 14 mm (0.55 inch) higher and 402 kg (886 lbs) lighter than BMW 8 Series (G15) (2020).
BMW 8 Series (G15) (2020) is 652 mm (25.67 inch) longer, 70 mm (2.76 inch) wider and has 140 liters (4.94 ft3) bigger cargo space than Audi TT RS (2018).