Invidia | R400 Signature Series Cat-Back (Valved, Res, Black Round Tips) (VW Golf MK7.5R)Invidia R400 MK7. 5 Golf R Cat Back (Valved, Res) 2018 2020 Invidia R400 tuned muffler exhaust systems offer a rich exhaust note which enhances the natural tone of your car's engine. Invidia's high flow design ensures efficient exhaust flow for optimum engine performance. Specifically designed to fill the sound gap between the Q300 and N1 system. The R400 produces a unique, aggressive note without any harsh cabin noise (particularly at highway