I dunno about this. I love being in a completely silent room whenan important race is being held. All you can hear is zipping motors and the odd clatter.
I love hearing engine sounds, but I don't think they will ever be realistic enough to be any good.
PS. It wasn't me who created that sound system, it was the car company.
BTW, before Fergy gets on it. The above mentioned phonomena is called wave superposition. It works on the principle that waves look like sine waves. When you put two sine waves together at any point, you must add up the two waves to make the wave that you hear. So if two speakers were working in complete harmony, the sound would be twice as loud as if just one speaker was working. In reality, they are always just a bit out, so the volume (amplitude) is increased but not doubled. In theory (has only been truly done several times) you can position the speakers so that at the point of the listener, the waves are in complete anti-phase and the sounds cancel each other out. This creates perfect silence. Turn off one speaker and it would come back again... scary...