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hey guys what's up. ok well i got a question about my filter on my intake. for the past little while when i turn off my car it sounds like my intake is winding down or something like that. it kinda sounds like when you turn a vaccuum cleaner off. like that low "whhiiirrrrr" sound. is this normal, or is my filter dirty? i can't think of it being anything else. i figured my filter might be dirty, but i'm not sure. if someone could let me know what's up i'd appreciate it. thanks.
 

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It's normal. When you shut your engine off, the pistons are still moving for another second or so, which means your engine is still sucking in air even when off.
 

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agreed. the whirring sound after turning off the engine is completely normal.
 
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