The ones on the west coast I've heard of use a fuel injector mounted near the end of the exhaust pipe witn a spark plug a little further down stream. I'm not sure how they rig it to work but a button under the dash sprays the fuel injector and sparks the plug. The exhaust gas blows the fuel past the spark plug and O-PAH!

 

has anyone found out exactly what this would take? i was going to ask my father this week what he thought what was needed. that was popular when he was young. no slam on the more experienced and wiser by the last comment.