No matter the condition of your 2018 CTS, OPGI has the Air Filter Elements & Wraps products you need to boost performance and get you back on the road. We currently carry five Air Filter Elements & Wraps items to choose from for your 2018 CTS, and our Price Match Guaranteed prices range from as little as $21.99 up to $99.99. OPGI offers K&N plus two other trusted brands of Air Filter Elements & Wraps products for your 2018 CTS, to help you find quality parts you can rely on. With OPGI's 45-day return policy, you can shop with the utmost confidence. Enjoy parts delivered directly to your home, or visit our sunny Southern California Showroom & Warehouse to check out our Air Filter Elements & Wraps items in person.