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Originally Posted by gherb
i just changed my stock airfilter to a k&n high flow air filter (model # E-1009). i noticed in the airbox and on the intake itself that there is a bypass hole above the intake and in the airbox allowing unfiltered air to enter the engine.
what is it for? and why would GM let dirty air into the engine? is it better for me to just remove the airbox and cover the bypass hole that's located above the filter?
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Ok... here is what I found.
The intake tube (for lack of better wording) has this hole. Why? I don't know... however...
If you look at the top of the airbox, where this opening fits into is a sealed compartment on the top of the airbox. It does not let dirty air into the intake after the filter. So, no need to worry all!
Any questions, let me know!