- Upgrade your semi truck's performance and style with our premium Dynaflex Exhaust 7 Inch systems, meticulously designed for Peterbilt models. Our selection includes the 7 Inch OEM Style Peterbilt Unibilt T4 389 2011-2015 Exhaust Kit, ensuring a perfect fit and superior durability. For those seeking enhanced emissions control, the 7 Inch Pickett Peterbilt 389 DPF+SCR DayCab 2011-2015 is an ideal choice. Additionally, the 7 Inch Pickett Peterbilt T4 389 Full DR 2011-2015 RP Exhaust Kit offers comprehensive exhaust solutions for your rig. Each kit is engineered to deliver optimal performance, ensuring your truck runs smoothly and efficiently. Whether you drive a Peterbilt 379 or a Peterbilt 579, our exhaust systems are compatible and reliable. We also offer essential accessories like Walker exhaust clamps and flexible exhaust pipes to complete your setup. Convert 33mm to inches with ease and find the perfect exhaust clamp for your needs. Explore our range of 7 Inch exhaust kits and experience the Dynaflex difference today! Don't miss out on enhancing your truck's performance and style—shop now and take your rig to the next level.