Quote Originally Posted by chevy 37 View Post
If you didn't like that stock muffler on your car or trucks, get it up to atround 50 and shut the engine off for about 5 seconds and then turn it back on. Usually blew a hole in the muffler or blew it completly apart. Caused by raw gas igniting. Not to good for your engine though
I can verify that works - but it may work better than you want. It happened to me once in my '68 GTO, but it wasn't intentional. I was driving along at about 70, and the engine died. It caught again, then I heard a monster of an explosion.

I pulled to a stop and looked under the hood. The ignition wires were mostly pulled loose and wrapped around the distributor. A weight had come loose and jammed it up. The distributor spun around and pulled the wires.

The speed I was going, I must have pumped quite a bit of fuel into the exhaust system. I thought the big boom was just a backfire, but when I replaced the distributor and fired the engine, it sounded like open headers. The explosion had split the Thrush header mufflers along the seam and folded them almost flat against the floor.

I would say try that at your own peril.