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
Amazon.com: FRAM Extra Guard CA10626 Replacement Engine Air Filter for Select Cadillac CTS Model, Provides Up to 12 Months or 12,000 Miles Filter Protection : Automotive
CTS Turbo Air Filter 3.5" for CTS-IT-270/270R/290/300/180 - CTS TURBO