The purpose of sending the air to the exhaust is to make sure your cats are hot enough to work. Without that added air, the cats won't work properly, and they will start to fuse together internally, clogging your exhaust. If you have removed your cats, or intend to, then this won't be an issue. If you are keeping cats in your exhaust, though, then you need to determine what the cause of the problem was, and repair it correctly.
Good luck either way.
Take care,
~Chris
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