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K&N engine air filter, washable and reusable: 2007-2017 Audi V6/V8 (Q5, S5, SQ5, A5, A5 Quattro, S4, A4 Quattro) E-1987 - Walmart.com
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Amazon.com: K&N Cold Air Intake Kit: Increase Acceleration & Engine Growl, Guaranteed to Increase Horsepower up to 14HP: Compatible with 2.0L, L4, 2009-2013 Audi (A4, A4 Cabriolet, A4 Quattro), 69-9505T : Automotive
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PG Air Filter PA5813 | Fits 2008-14 Audi A5 Quattro, 2008-16 A5, 2008-18 S5, 2009-14 A4 Quattro - Walmart.com
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