first, I think he is talking about stalling the car. flameout is usually used in jets for when the fire goes out in the engine and you got no more go.

second you dont need a switch or a spark plug in the exhast to get fire out of the pipes... what you need is a hot rod (ie a nice hemi dodge)

rev the sucker and take your foot off the gas. now what happens is that the engine is sucking more fuel then its buring and raw fuel is going into the exhast.

if the exhast is hot when the fuel hits the air you get flames.

now alot of show cars will have spark plugs to aid the ignition and some even have fuel injectors in the exhast (either gas or more commonly lighter fluid) or spray bars at the tips.

one show car here in NJ has the spray bars and can shoot flames 20 feet out the back. its an old chevy or something (cant remember the model or year...56 maybe?) but its white