DownForceSolutions — 2017-2021 Honda Civic Si rear diffuser
Civic Diffusers – AeroflowDynamics
Amazon.com: Rear Bumper Diffuser With Red LED 3rd Brake Light & Decorative Exhaust Tips Compatible with 2016-2018 Honda Civic 4 Door Sedan Model : Automotive
Amazon.com: Syon Auto FITS 2016-2020 HONDA CIVIC SEDAN MCxSTYLE BLK REAR BUMPER DIFFUSER REPLACEMENT,Matte Black : Automotive
YOF" Rear Diffuser Honda for 2022+ Honda Civic – ultimatemotorsports