Shop Kenworth W900B & W900L Exhaust Kits

Take your Kenworth W900B/W900L to the next level with a complete exhaust renewal. Shop our vast kit options from American Eagle, Lincoln Chrome, and BESTfit in 6, 7, and 8 inch diameters.

Kenworth W900B/W900L Exhaust Kits

Your Kenworth W900 wasn’t built to blend in—and neither should your exhaust. Our full lineup of Kenworth W900B and W900L exhaust kits is designed to give your rig the look, sound, and performance it deserves. Whether you're replacing a worn system or building a custom show-stopper, we've got everything you need to make your stacks stand tall and loud.

Kenworth W900B/900L Exhaust Kit Upgrades

These kits are loaded with high-performance parts that are engineered for durability and road-tested for the long haul. Here are the benefits: - Stainless Steel Construction: Resists corrosion, rust, and road abuse - Custom Stack Options: Choose from flat tops, miters, West Coast turnouts, and bull hauler pipes - Flexible Fitment: Above- or below-frame elbows, 90-degree and multi-bend options - Complete Solutions: Each kit comes with the pipes, clamps, brackets, and elbows you need - Performance Boost: Improve airflow and backpressure for more efficient exhaust flow and better sound

Better Style, Better Performance

Whether you want a clean OE-style look or full-on chrome attitude, our exhaust kits let you customize your Kenworth W900B or W900L with confidence. Choose the finish and profile that matches your truck’s personality—from classic straight pipes with secure exhaust mounting brackets to aggressive-looking chrome-polished turnout stack tops. If you're looking to further enhance your rig, consider adding turbo parts a replacement turbo or a DPF muffler for the Kenworth W900B/W900L.

Designed to be Show Ready

Don’t settle for weak flow or outdated looks. Our aftermarket Kenworth exhaust kits are the perfect upgrade for drivers who want to stand out and stay strong. Shop exhaust kits now and turn your Kenworth W900 into a rolling statement.

Frequently Asked Questions About Kenworth W900B/W900L Exhaust Kits

What years and models are these exhaust kits compatible with?

Our exhaust kits are designed specifically for Kenworth W900B models (1987-2003) and W900L models (1987-present). The main difference between models is the hood length - W900B has a 119" BBC while W900L has a 130" BBC. Most kits are universal between both models, but always verify the specific kit's compatibility with your truck's year and engine configuration before ordering. Pre-2007 and post-2007 models may require different kits due to emissions equipment changes.

What's the difference between aluminized and chrome exhaust stacks?

Aluminized steel stacks offer excellent corrosion resistance at a lower price point and typically last 5-7 years with proper maintenance. Chrome stacks provide superior shine and durability, lasting 10+ years, but cost significantly more. Chrome requires regular polishing to maintain its mirror finish, while aluminized develops a matte appearance over time. For trucks in harsh climates or those hauling corrosive materials, chrome is worth the investment. Show trucks almost always choose chrome for the aesthetic appeal.

How difficult is the installation and what tools do I need?

Most exhaust kit installations take 4-6 hours for experienced mechanics and 6-10 hours for first-timers. Essential tools include: socket sets (3/8" to 3/4"), torque wrench, band clamp tools, exhaust hangers, high-temp sealant, and safety equipment. Common challenges include aligning stack brackets with existing frame holes and properly sealing connections. We recommend having a helper for positioning heavy stacks. Professional installation typically costs $300-600 if you prefer not to DIY.

Will aftermarket exhaust kits affect my engine performance or warranty?

Quality exhaust kits that maintain proper backpressure (typically 2-3 psi at rated RPM) won't negatively impact performance. In fact, many drivers report improved fuel economy and slight horsepower gains with less restrictive systems. However, removing emissions equipment like DPF or mufflers may void warranties and violate regulations. Always check local laws and warranty terms. For maximum performance without legal issues, choose EPA-compliant kits that work with your existing emissions systems.

What size exhaust stacks should I choose - 5", 6", or 7"?

Stack diameter depends on your engine size and intended use. 5" stacks work well for engines under 500HP and provide good fuel economy. 6" stacks are the most popular choice for 500-600HP engines, offering the best balance of performance and appearance. 7" stacks are typically for high-horsepower engines (600HP+) or show trucks prioritizing looks. Larger stacks create more drone at highway speeds but provide better exhaust flow. Consider your cab-to-sleeper gap when choosing stack length - typically 48" to 72" options are available.