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I'm not sure how CarMax is with their warranties & you might want to read up on it because even just swapping out the intake might void their warranty.
If you're forced to stay 100% stock under the warranty agreement, you'll prob benefit more from the JB4 & running E85 blends. If you can mod (Intake, DPs, etc) & the tune would be the only concern, the COBB would make much more sense & offer greater performance gains.
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