From a 2.0-liter engine, that would comfortably give it the highest specific output of any production 2.0-liter car, and make Mercedes-Benz's 355-horse A45 AMG (and the CLA45 AMG sedan sold in the U.S.) look... well, a little weak.
Incredibly, the required modifications to regular Golf R’s 2.0-liter turbo four in its transformation to R 400 spec were rather minor. Boost pressure was increased, internals uprated, and air and fuel flow optimized. In this latest video from AutoEmotionenTV, we get to hear the Golf R 400’s potency for the first time. Hopefully any production version sounds just as good.