exhaust fireball

A&Q about 350Z
Q:

hi

I have a few questions I can't find an answer to so maybe someone can enlighten me.

Why do racing/high performance cars let out fireball from the exhaust pipe when they downshilt?

Is this only for turbo charged cars? Can NA do this? Is there a certain horsepower minimun?

thanks
A:

high exhaust temps and a lot of unburned fuel
A:

depends which race car you're talking about, but many use anti-lag, which helps keep the turbo spooled when you chop throttle. dumps a lot of fuel in and retards the timing. Its not very good for the turbo though, or the manifold, or anything else.
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