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If it pulls air from around the engine, it's NOT a CAI. I know they advertise it as such, but they are simply wrong.

Agreed. At the very worst, you just performed routine maintnance. Not good to run a diesel with a clogged filter - hard on the injector pump. And on a 2001 that has spent the last two + years running on ULSD (which I don't believe the '01s were designed for) it's already not getting the...