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I think its because car engines sound so quiet, flat and boring these days due to economy, emissions and sound regulations, even on sportscars.
Back when you could have a high revving, naturally aspirated engine sending its exhaust through a nearly straight piped exhaust, car engines, even economy ones, often sounded great. A nice, linear, rising crescendo of mechanical fury, winding itself out in song. Just listen to sportscars and racecars of the 60s, 70s, 80s and 90s - even the 4 cylinder ones could sound fantastic, better than most 6 or 8 cylinder cars today.
To make up for the quieter, heavily muffled, emissions choked exhaust sounds of today, people decided burbles, farts, and pops and bangs made up for it, hence these trends. It’s a result of trying to make the engine sound interesting and ‘sporty’ given they can no longer have a simple, loud, sonorous high revving exhaust note anymore. That’s my theory.
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