Right On! Mighty backfires on a car of mine blew the muffler completely off. They were LOUD! I discovered it would happen after I hooked an AIR pump up on my Mercedes but did not use the Anti Backfire Valve. When I took foot off the gas, extra fuel got sucked out of the carb and when it came out the exhaust valve and ran into that nice stream of fresh air the explosion could be heard for quite a ways. I thought it was funny until the muffler got blown off. The outside of the muffler had flattened right out and the insides were bouncing on the pavement. Then I had to buy a new muffler and figure out how to avoid the backfires.

R.