Dumb Question about air coming from engine bay

[IllusionX]

Intake sucks air. Exhaust shoots air/gas

[duendeverde]

Originally Posted by IllusionX

Intake sucks air. Exhaust shoots air/gas

You are absolutely right my friend, but the air i'm feeling is coming from the engine bay not from the header to the exhaust. I thought that moving parts from the engine like pistons or whatever with their movements generate air but since the engine block is sealed I was curious. I have no check engine light ON