What I mean, is when someone puts an aftermarket exhaust on to their car and revs the engine, when it’s coming back to the lower RPMs it makes a skipping sound.
Example : https://www.instagram.com/p/CLxScV_ByYA/?igshid=1nnro6srozt34
In: Other
What LGV said, but put more briefly; unburnt fuel sent out of the cylinder together with exhaust gasses, then ignited inside the hot exhaust.
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