Years ago I got to drive a schools Dodge D600 box van with a 318 V-8 and dual exhausts.
It was easy to get it to backfire by spooling it up, shutting the ignition off for a second or two, then turning it back on. Spooked more than a few girls doing that.
The last (and best) time I did that, both mufflers exploded like a morning glory. It was a righteous blast, by the way.
The resident mechanic suspected I did something to the truck on that trip, but I just told him "it was running rough, and that happened".
LOL