- Upgrade your semi truck's performance and style with our premium Dynaflex Exhaust 6 Inch systems, designed to deliver unparalleled efficiency and a sleek look. Explore our top-rated products, including the 6 Inch Peterbilt 359/379/389G 55" Full Diameter Exhaust Kit, perfect for enhancing your truck's power and sound. For those driving a Peterbilt 379 from 1987-2003, our 6 Inch OEM Style Elbow Exhaust Kits offer a seamless fit and superior durability. If you own a Peterbilt 379 from 2003-2006, our 6 Inch 90 Degree Elbow Exhaust Kits are engineered to provide optimal performance and longevity. Each kit is meticulously crafted to meet the highest standards, ensuring your truck runs smoothly and efficiently. Don't miss out on these essential upgrades for your Peterbilt 379, whether you need a full diameter exhaust kit or a 90-degree elbow solution. Shop now and experience the difference with our top-quality Dynaflex Exhaust systems. Additionally, we offer a range of products for other models, including the Ford F650 and Peterbilt 567. Complement your exhaust system with Walker Exhaust components, exhaust clamps, and flexible exhaust pipes. Convert 33mm to inches easily with our tools, and find the perfect exhaust clamp for your Ford Powerstroke 6.0. Enhance your truck's visibility with our 57 inch tail lights. Take action now and elevate your truck's performance and style with our exceptional Dynaflex Exhaust systems.