According to Flowmaster, this kit actually will fit the naturally-aspirated 3.5L V6. The issue with the 2015 and 2016 F150s is that there is a 3.5L EcoBoost V6 (turbocharged and direct-injected) and a naturally-aspirated 3.5L V6 (no turbochargers with standard rail injection), and not all parts and exhaust systems are cross-compatible.