Yeah sure mustangs, and corvettes sound great, but.....come on have you ever heard the V8 of a ferrari, or a mitsubushi lancer evo, both are different sounds, but still are perfectly street legal cars, the emissions on the ferrari are one of rthe lowest, if you have a chance of hearing a ferrari, really going fast, or a mitsubishi evo, revving up with the blow off valve sound every shift, now thats an engine sound!!!!!
and i think there is replacement for displacement, turbos, and variable time valve can make small engines really powerfull, still i would prefer a V8 for everyday driving, but a turbo or a high revving engine for racing.