Car companies have worked for years to deaden car interiors to block out engine and road noise, This is mostly because for a lot of people, engine noise is just noise, and they would rather not hear it. The amount of deadening applied under the hood, on the firewall, on the floor, on body panels, is stagerring, and then tere are folks who fit even more deadening (I'm not talking the audiophile type - just people who want a quiet car) like rubber undercoatings to reduce road noise Then they realize that this has turned off another demographic that likes to hear this noise. They decide that playing the sound back through speakers (there have been mechanical approaches as well ) was the cheapest option. This way, you could have a car that was quiet most of the time, but could get loud if you wanted it to. Honestly I don't see a problem here. The growl of an engine is just an indicator of its performance . If you designed an intake/exhaust system just to sound good, how is it different from an electronic system which does that ?