I've moved back and forth between this mod and the original. I don't doubt this is more authentic to the actual race car, but I prefer the original as it highlights the engine note more purely and the result is a less muffled and more exciting sound. YMMV.
Most of the time you have to dismiss most of the samples you do cause they aren't good enough, too short, weird noises...etc.
Unless some new videos pop out on youtube, the audi will have to stay as it is.