exhaust flame thrower kit

[Oborny71]

ok, I want to clear up some questions about flame thrower exhaust kits. I know there are several places on the internet that you can buy them from, but is it worth buying the kit, or can you make one yourself. if you buy the kit you pay $80- 100 bucks for it and you still have to buy the coil and spark plug and wires. Now i've been doing research and some people say all you need is a coil, spark plug and swich. while others say there has to be a pulsating spark to light it, so you need some kind of control box. Also, some say you have to run the carb rich, choke it or cut out ignition from one or two cylinders while others say you don't have to do anything b/c it will burn the natural leftover fuel in the exhaust. anybody ever built there own flame thrower kit? confused, any help is much appreciated.