- Upgrade your semi truck with our premium No Bend Top Stacks 6 Inch, designed for durability and performance. Perfectly compatible with a range of Western Star models, our top stacks ensure optimal exhaust flow and a sleek look. Explore our related products, including the 6 Inch Western Star 4900 Heritage OEM Style Elbow Exhaust Kit, ideal for maintaining the classic look of your truck while enhancing its performance. For older models, the 6 Inch Western Star 4900/Constellation Exhaust Kit 1996-2000 offers a perfect fit, while the 2000-Newer version caters to more recent models. If you own a Western Star 4900/Stratosphere from 2002-2007, our specialized exhaust kits are tailored to meet your needs. Additionally, the 6 Inch Western Star LowMax Flat Top Cab Exhaust Kit 2002-2006 provides a seamless upgrade for LowMax models. For those seeking a distinctive style, the Western Star 6 Inch Lincoln Exhaust Package is available in both Flat and Miter designs, ensuring you find the perfect match for your truck. Enhance your semi truck's performance and aesthetic with our top-quality exhaust solutions, designed to meet the highest standards of durability and efficiency. Whether you're driving a Ford F650, GMC Topkick, or Peterbilt 567, our products are engineered to deliver superior results. Don't forget to check out our range of shift knobs and shifter knobs to complete your truck's interior upgrade. Plus, we offer essential components like NOx sensors and snow socks to keep your vehicle running smoothly in all conditions. Convert 33mm to inches effortlessly with our handy tools and ensure your Ford Powerstroke 6.0 is always in top shape. Visit Freightliner Northwest for more information and take the next step in upgrading your semi truck today!