Ford Mustang Ecoboost Forum banner

afr

  1. Mustang EcoBoost Discussions
    So I have had the car for about 2 years now and bought it modified. Cold air intake, 3 inch downpipe with flowmasters, and what looks like a C&L bypass valve. Its tuned on a Bama X4. It has a CEL P0420 cuz of the high flow downpipe but has always ran fine with it. AFR would stick to 14.0 -14.1...
Top