Performance exhaust systems are available in multiple sizes for your 2017-2025 Ford 6.7L Powerstroke. The most common is a four-inch, which is designed for vehicles creating less than 450 horsepower. Larger diameter exhaust systems, such as five-inch, are typically recommended for vehicles creating greater than 450 horsepower. Performance exhaust systems increase exhaust flow by eliminating the restrictive stock muffler, replacing factory crimped bends with smooth mandrel-bent tubing, and increasing the overall pipe diameter. The benefits of increased exhaust flow are reduced exhaust gas temperatures, increased horsepower and torque, fuel mileage gains, and a deep-throaty sound. With a large network of well-respected brands to choose from, such as AFE Power, Banks Power, Gibson Exhaust, Magnaflow Performance Exhaust, and MBRP Inc., you can select the exhaust system for your F-250/350 Super Duty that looks right to you without any concerns about its quality.