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<< No, you don't install spark plugs in the exhaust. There are two ways it happens. In rally cars it happens because of the anti-lag system for the turbo, to keep it spinning fast when not on the throttle. Or in a lot of race cars without turbos, it occurs when the car is a bit rich, and unspent fuel finds its way into the exhaust and is burned off by the hot headers/exhaust pipes. >>
umm yeah it is. car guys have been doing this to hot rods for a long time. i remember going to car shows as a kid with my dad and seeing flamethrower competitions. >>
Maybe if you're trying to build a show car. The video he has if of cars on a race track, not a hot rod, so I assume that's what he was talking about. The cars in that video are spitting flames for a legit performance reason (actually a downside to a legit performance enhancement), not for show.