That is a supercharger, or "blower".
What has happened there, is too much pressure. It's referred to colloquially as "the blower sneezed". It's a righteous explosion sometimes, and can smithereen the body right off of a funny car.
Here's a driver's seat point of view of a blower sneezing:
They can be much more violent. FYI, the 'white stuff' coming out the exhaust pipes is raw, unburned fuel.
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