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Theres actually another explanation for this.
Some high power, turbo charged cars(like in the WRC) are equiped with a system that lets a little bit of unexploded fuel into the exhaust system. Now why the hell would you want to do that you may ask? well simple, it makes you faster.
What it does is that as you shift up to another gear you'd normally have to wait a second or so for your turbo to spool up before it starts creating boost. With this system the small bit of fuel thats in the exhaust system is ignited when you shift. The expansion of the gases causes the turbo to spool while your shifting, so as soon as you put it back into gear you have instant boost.
However, this isn't something you put on your own car, at least not unless you have a fortune to spend on new turbos. As you would expect, causing an explosion in the turbo isn't a good thing. This system has a tendency to ruin a turbo after one race.
Other then that, like 454 said, it could just be a ricer with a spark plug bolted to his exhaust.
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Keiichi Tsuchiya isn't the drift king,
Michael Schumacher Is.
The only thing better than cars is Music... maybe.
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