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This falls under the category of "what does it matter", and a car at a car show got me thinking. The subject is sidepipe exhaust systems on cars. Think of factory built cars, as opposed to custom street rods. For example, Shelby Cobras, which evidently all were factory manufactured with them. Next, to the Corvette world, where they were popular on the C3 cars, either factory option or as a dealer installed item. But that is all the ones I can think of.
Regarding personalization of vehicles, have you ever seen a Mustang with side exhaust? What about a 1963 Thunderbird. One at a car show had been customized with aftermarket wheels, etc., and a side exhaust system. To me, it looked hideous, and ruined the look of a nice classic car. But I realize it is all personal opinion.