Okay always wondered.....The flames outa the tail pipe. Someone told me that if the timing was set wrong. like really wrong it would do that but wouldnt get past your cat. I was also told that you can put a sparkplug in your tail pipe to ignite the fumes. I dont think the spark plug thing is true. Putting a spark plug in your tail pipe to ignite your exaust gasses.......Hmm isnt your tail pipe just under your gas tank? What about those people who dont have a tail pipe? I have a fireball muffler. What then? anyone know on this?