33-2209 - K&N Air Filter For Audi A4 Quattro 1.8/2.0/3.0/3.2 Petrol 2002 - 2009 | eBay
K&N Replacement Air Filter Audi 80 1988 | E-0646
Audi Air Filter (K&N) for B5 A4/S4, C5 A6/Allroad
K&N Air Filter Install - Audi A4 1.8T Prior Experience: None Cost: approx. $50 Time: aprrox. 20 minutes Discuss this mod - Here After getting my APR stage 1, it was recommended that I install a K&N drop in filter. Although air filters should be changed ...
Audi K&N Performance Air Filter (A4 S4 RS4 B6 B7) 06C133843 by KN Engineering | Europa Parts
K&n AUDI A4 1.8l Turbo 150bhp Performance Intake Kit 57-0593 for sale online | eBay