Your exhaust is 600+ degrees. Think about that for a second.
And the MAF sensor, hereby known as MAF, tells the ecu how much air is comming in to the engine. The ecu dumps gas into the engine based on the airflow the maf measures. If you shift, the maf has already read the airflow and dumped the gas into the engine, but you are shifting, so the BOV is opening. This gets all the pre-measured air out of the tubing. Since there is no air there, and an excess of gas, only the gas that can be burned (very little) is burned, and the rest is shot down the exhaust pipe. Since the metal is 600+ degrees, it post-ignites the gas, which expands and sends a fireball out the tailpipe.
The harm this causes is little holes get created in your (expensive?) exhaust system. No Good. Also, your car will bog down due to the flooding of the cylinders.
-Jeff
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