Placing a spark plug in the exhaust is one way to make flames come out of your vehicle. Five inches from the end of the exhaust, attach a spark plug, route the wiring to the driver, and install a switch to start the spark. Connect the cable from the switch to the positive terminal of your automobile battery on the opposite side. According to many, this method is really simple to use and is a lot of fun. However, it might also be risky, so try to refrain from going overboard if you don't want to wreck your car and lose your life.