Audi TT RS (2018) is 178 kg (392 lbs) lighter than Opel Insignia Sports Tourer (2015).
Opel Insignia Sports Tourer (2015) is 722 mm (28.43 inch) longer, 24 mm (0.94 inch) wider, 158 mm (6.22 inch) higher and has 280 liters (9.89 ft3) bigger cargo space than Audi TT RS (2018).