I am currently running a stock air filter, but removed the air box and made a heat shield from 304SS. The truck appears a bit peppier, but it is hard to tell as my wife is the full time driver. It is a little noisier off of the line. Not really a noticeable difference in gas mileage, but its not a true CAI. Next is to get the K&N Filter for it, followed by a CAI kit (if the wife allows it).
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