becauce the muffler is (was) stopped up. If you switch of your ignition while driveing at speed, their is no spark to the plugs and the raw fuel wont explode till it gets to the hot muffler, many times this will damage your muffler, and creates a very loud backfire!
In extreme cases, it can blow the muffler wide open.
It can cause massive Engine failure and blow up the whole car, so be careful.
The muffler is probably worn out and should be replaced.
v 12 motor swap
Hacking your Wii!
Honestly yes. it can cause major problems and all together it could cause your engine to blow. so id change them they arent that hard.
Running too rich, timing off. Search your engine and "backfire"
AN over-current situation. Could be a short to ground, or a circuit overload.
cause of excessive blow- by
Put the Bypass Valve back on!
yes