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[–] 1 pt (edited )

Some cars when supped up. When you shift. Unburnt fuel gets past and ignites in the exhaust. Also you can wire in a switch to cut ignition spark, then unburnt fuel gets to the hot exhaust.

Edit: 2 step rpm limiters launch controls do it too. Example. https://youtu.be/pijESQAToLI?t=99