system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do some high-powered cars "explode" out of the exhaust when revving the engine or accelerating?
gpt
It's the sound of fuel igniting in the exhaust manifold. 

Generally it's caused by the throttle being opened and suddenly closed, momentarily leaving the engine with too much fuel and not enough air to burn it with in the cylinder. The normal action of the pistons pushes the unburned fuel out of the cylinders via the exhaust valves, where it lights off in the hot exhaust system.