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      11-25-2012, 10:50 PM   #2
benzy89
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Drives: '08 E90 335i
Join Date: Jan 2012
Location: Northern NJ

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2008 BMW 335i  [3.75]
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.