How come we don't hear the car's engine on TV like the Shell commercial and this cool Red Bull video?

Having been in the pits for a few races in the past (courtesy of the old ARROWS F1 Team), I can tell you that this doesn't even come close to the real sound. When you're near the car, you can FEEL the sound. Even with earplugs, its physically painful. What you hear on TV (or your computer) is as good as it can get, remembering that the cameras have either telephoto lenses (meaning that they're no where near as close to the car as it looks), and the in-car camera is set in front of the engine - and most of the sound is behind the car.