COBB Accessport V3 – 2017–2020 Honda Civic Si FC1/FC3 (6MT)
Verified US-market fitment
2017–2020 US-market Honda Civic Si FC1/FC3 with factory manual transmission.
ECU / transmission / installation requirements
Si only; not regular Civic, FK8 Civic Type R, or 2022+ Civic Si FE1.
Manufacturer application support is determined by ECU calibration, vehicle configuration, year, and transmission; the Year/Make/Model lookup does not validate every ECU box code. Before installation, check the exact vehicle and software compatibility against COBB instructions.
Emissions: COBB lists this Accessport as 50-state legal when used in accordance with its application guidance and applicable CARB Executive Orders. Check approved maps for your vehicle; availability and legality of a specific tune can differ from hardware eligibility.
California Proposition 65: WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov.
COBB manufacturer reference: AP3-HON-002 supported applications and product information.
