CARBONIZED CABIN AIR FILTER FOR CADILLAC CTS STS SRX CTS-V US SELLER C $2.19 tarigs.com
CTS Turbo 1" breather filter rubber base – Euro Performance Center
CTS Turbo Audi B8/B8.5 S4, S5, Q5, SQ5 V6T Supercharged Air Intake Sys – Euro Performance Center
Amazon.com: K&N Engine Air Filter: Increase Power & Acceleration, Washable, Premium, Replacement Car Air Filter: Compatible with 2008-2015 Cadillac CTS and CTS-V, 33-2411 : Automotive
CTS B-Cool Billet 2.0T FSI and 2.5L Oil Filter Housing - Extreme Power House