Aston Martin DB9 (2016) is 261 mm (10.28 inch) longer and 84 mm (3.31 inch) wider than Audi A3 (Sedan) (2017).
Audi A3 (Sedan) (2017) is 133 mm (5.24 inch) higher, 525 kg (1,157 lbs) lighter and has 238 liters (8.40 ft3) bigger cargo space than Aston Martin DB9 (2016).
