The 3.5L EcoBoost V6 under the hood of your 2021 F150 may be powerful, but the stock exhaust system sure doesn't let you know it. Adding an aftermarket exhaust system can give your awesome 2021 F150 EcoBoost a brutal, new sound and possibly some extra power. Aftermarket cat-backs change your F150's exhaust note and can also alter your truck's looks with different tips and exit styles. Performance downpipes free up restrictions in your truck's exhaust system to allow it to make more power and torque with the right tuning.