Rob, i don´t understand what do you want to compare with that other suggestion, i think that other is totally innecesary and unrealistic.
It could be more easy and realistic try to implement some of our suggestions in a
tycoon game than mount ¨speaker system¨ to the cars.... and, of course, try to drive our cars at RFactor.
Yes, if you are sucesful... At this point i think:
¨Do you want to make a business game? or a driving simulation game?¨
They are totally different games. And sincerely, I prefer a tycoon game, to drive already I have Forza and GT5. And yes, I know it, I have not created those cars, but I think that the result would not be so good either.
But, you are the devs.... you can choose what do you want to make. But I am afraid that you do not give him the importance that deserves to the economic component of the game.

To create engines and cars is only a part of the game.