Maybe I'm being nostalgic for something I never even personally knew, but knowing that I'll never get to hear this sound from my car makes me jealous of my parents:The unit body on my Porsche 911 is a 1973 - the rest of it is different years to get the lightest, strongest, fastest parts...
They really are simple cars (except for some of the engine internals). Mine has a Pioneer SuperTuner but needs a better head unit...
One thing I did was to take off the fuel injection (on the 1986 engine with hotrodded modifications to the heads, pistons, cams) and put on some carbs for more induction noise.
Which brings up the issue of what types of car motors have the most mellifluous engine noises...