Re: not enough backpressure?
In the late 1950's my exhaust manifold broke off at the muffler clamp.
Ran the car with no muffler & no tailpipe for a couple of years.
Loud noise but ran fine. Had to idle while going through the Drive-in theater.
Could see the exhaust flames through the home made floor board openings while running at night.
Don't forget to check the wind direction before starting.
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