I wanted to make sure I was getting the best performance so I got the entire Airaid system (Quick Fit and Snorkel). I have a Dodge Hemi 5.7 and after removing and testing the stock Dodge pipe (or "Resonator" as they call it) I believe the Airaid pipe will perform no better. So I would recommend just buying a QuickFit box and filter. I don't think the extra money was worth it. At the same time, I have had the system for about a month and am very satisfied. This didn't result in a significant increase in engine noise (at least I can't hear it through the Flowmaster 50HD muffler). With the Flowmaster and Airaid I increased my fuel economy by about 1mpg from 11.8 to about 12.8.
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