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K&N Cold Air Intake Kit: High Performance, Guaranteed to Increase Horsepower: 2009-2013 Audi (A4, A4 Cabriolet, A4 Quattro) 2.0L L4, 69-9505T 2011 Audi A4 - Walmart.com
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Audi K&N Performance Air Filter (A4 A5 Q5 allroad B8 2.0T) 8R0133843K by KN Engineering | Europa Parts
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Amazon.com: K&N Cold Air Intake Kit: Increase Acceleration & Engine Growl, Guaranteed to Increase Horsepower up to 15HP: Compatible with 2.0L, L4, 2014-2015 Audi (A4, A5, A6), 69-9508T : Automotive
BMC 07-12 Audi A4 (8K/B8) 2.7 TDI Replacement Cylindrical Air Filter - FB533/08-01 - Unleashed Tuning
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