From what I can hear in that RS5 test, that car doesn't have a V8 NA: it's a 3.0 supercharged or turbocharged or a V8 supercarged. That is not the sound of big V8 NA. And, also, that movie doesn't tell us that test mule has the final engine. Maybe it's just another test, with an engine that will never make it to production. They still have time to choose the right one, my bet there are at least 2 different engines testing at the same time for the RS5.