I've heard that you can make flames shoot out of your exhaust pipe in your car by drilling a hole and putting a spark plug a few inches from the end. Then, by connecting it to the battery and a switch, you could make a sort of flamethrower. I would just like to know if this is a buncha baloney or not, without having to actually go out and ruin an exhaust to find out.
True. Your cat doesn't remove all the gases, so some will be expeled making it potentially flamable. I heard that on newer cars the cat pretty much filters a lot of it out preventing this to work. Yeah it's possible. But cool? No!