I have a CAI (AFE or AEM, can't remember which) and it growled like that a lot more at the stock setting than it does now that I'm running the 87 tow (level 2) canned tune. That along with the shift point changes has made the truck more drivable. I can't wait till I get my custom tunes! Hopefully that growl will go away or at least be a lot quieter and I can actually take advantage of the performance that the CAI is supposed to provide. I'm already happy with what level 2 has done.
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