Have a 2013 S5 that i bought a couple months ago, installed AWE S-FLO filter+tube in the stock air box.
$150 obo , all original parts included
I also modified my stock air box that I may be willing to sell if interested - make an offer - I made the opening of the air box larger internally and drilled out the additional hole near the lower bottom of the air box (a common mod done by others here). There is some increased whine from this set up
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