- Upgrade your semi truck's performance and style with the Dynaflex Exhaust 6 Inch, designed to deliver superior exhaust flow and durability. Perfect for Peterbilt models, our range includes the 6 Inch OEM Style Peterbilt Unibilt T4 389 2011-2015 Exhaust Kit, ensuring a seamless fit and optimal performance. For those seeking precision and reliability, the 6 Inch 90 Deg Peterbilt Unibilt T4 389 2011-2015 Exhaust Kit offers unmatched quality. Additionally, the 6 Inch 90 Deg Elbow Peterbilt 389 DPF+SCR DayCab 2011-2015 is engineered to meet the highest standards, providing a perfect solution for your exhaust needs. Enhance your truck's efficiency and aesthetics with our top-tier exhaust systems, designed specifically for Peterbilt models from 2011 to 2015. Whether you're driving a Ford F650 or a Peterbilt 567, our products, including Walker exhaust components, exhaust clamps, and flexible exhaust pipes, ensure optimal performance. Convert 33mm to inches effortlessly with our precise exhaust clamp solutions, and explore our 57 inch tail lights for added style. Experience the Dynaflex difference today and take your truck to the next level.