Peugeot 408 (2017) is 335 mm (13.19 inch) longer, 80 mm (3.15 inch) wider, 18 mm (0.71 inch) higher and has 70 liters (2.47 ft3) bigger cargo space than Subaru Impreza GP (2014).
Subaru Impreza GP (2014) is 25 kg (55 lbs) lighter than Peugeot 408 (2017).