"Lloyd E. Sponenburgh" lloydspinsidemindspring.com fired this volley in
. 3.70:

There's a reason there are "tuned" exhausts, and large diameter pipes.

BTW... I wasn't being snide of facetious. How do you think large auto
repair facilities get exhaust fumes away from cars in service or being
tested?

They do it with LONG exhaust hoses designed to purpose.

The length isn't very important if it's: 1) large enough, or 2) tuned to
the rpm at which the engine is running.

I know this might not make sense unless you understand the geometry, but
running an exhaust pipe out to open air IS running it into a long exhaust
pipe. The particular "pipe" happens to be very, very large in diameter,
but also very, very long. And it doesn't cause the engine to stop.

LLoyd