You suggested the NA cars to have a supercharger SOUND (while not having one), rather the implementation of superchargers itself, that's why some are calling you ricer (which I couldn't agree more, how on earth did you got the idea for that?)...
I often thought why there isn't a supercharger in LfS, but come to think of it, there just isn't a car in LfS that would fit the installation of a supercharger (most like TC, but that's another thread)... So, it's fine with me should there be a supercharged car in the future in LfS, but I don't think this is an issue that needs to be adressed in the near future...