Mickey Mouse gimmick. When an engine has some real steam in the boiler you know it, its not just about the sound.
An engine sounds like what it sounds like.
A turbo four BMW probably doesn't make any wonderful noises, but it is what it is.
Way back when, I can recall seeing really fast 934s as well as a turbo toolshed BMW raced.
What was so impressive about these cars was how quietly they went about their business of speed.
OTOH, any Chevy whether SBC or BBC would shake your guts with its thunder while still not being in the running with the turbo Porsches. Then their was the Aston-Martin V-8 powered Nimrod, which made wonderful noises while running well behind the leading cars. There were also a couple of very aggressively driven Toyota silhouette racers that made the most pleasing high rpm wail. These stock-based looking cars were revealed as tube frame silhouette cars when one of them had some sort of tangle which ripped up its bodywork.
Where might one have seen all of these cars raced on the same track at the same time?
Anyone ever heard of the Lumbermans 500, which was run at least a couple of times IIRC?
An entertaining event from our pre-childbirth days when we rarely missed an event at this track.