When I was growing up in the 50's it was popular among us to modify the muffler and exhaust system of our cars. We'd take the muffler off, and if we could afford it, replace the muffler with "Hollywoods" or "glass packs" that gave the car a mellow roar. If we couldn't afford the commercial applications we'd just put in a "straight pipe" with no muffler. It would be louder but not as mellow.
Perhaps you have come behind a car that has a huge canister below the back bumper. That's a resonator that fulfills the same mission of enhancing the cars sound. Bangkok is full of Honda Civics and similar cars so outfitted. It gives the traffic a certain resonant roar.
But it's not only the cars that have been so modified. Most of the huge tour buses have also been given exhaust treatment that gives them a distinct sound. It's a sound that I like.
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