Myself also.
Whatever the effect it's probably minimal for an exhaust buried in the underbody. The edge cases would include side pipes at the rocker panel and vertical stacks on a truck.
I gave it my best shot in 2014. Here's vertical stacks with a Coanda nozzle the full height. Because why not?
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
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