Shop Kenworth W990 Chrome Stacks & Tops

Customize your Kenworth W990 with aftermarket chrome stacks and chrome tops. Browse our selection of west coast turnout stacks, miter top stacks, flat top stacks, bull hauler top stacks and curve top stacks.

Kenworth W990 Chrome Stacks & Tops

Kenworth W990 Chrome Stacks & Tops The Kenworth W990 is known for its commanding presence on the road, and this product lineup of chrome stacks and tops elevates that bold look even further. These premium exhaust components are designed to provide both style and function, offering a variety of options to customize the appearance and performance of your W990. Whether you prefer the classic look of a miter-cut stack or the sleek curves of a turnout top, you'll find a wide selection to choose from. Many of the stacks and tops feature chrome plating for a gleaming finish that catches the eye, while others offer a more subdued matte black or brushed steel aesthetic. No matter your preference, these parts are built to withstand the rigors of heavy-duty use and deliver long-lasting durability. Beyond just aesthetics, these chrome stacks and tops also contribute to enhanced airflow and engine efficiency. The carefully engineered designs help optimize exhaust flow, reducing backpressure and improving overall performance. So not only will your W990 look amazing, but it will also run at its best. Upgrade the style and function of your Kenworth W990 with these premium chrome stacks and tops, available in a variety of sizes, styles, and configurations to suit your specific needs and preferences. Elevate your rig's presence on the road while enjoying the benefits of improved airflow and efficiency.

Frequently Asked Questions About Kenworth W990 Chrome Stacks & Tops

What size exhaust stacks fit the Kenworth W990, and how do I measure for the correct fit?

The Kenworth W990 typically accommodates 5-inch or 6-inch diameter stacks, depending on your exhaust system configuration. To measure correctly, check your existing exhaust pipe outer diameter (OD) at the connection point. Most W990 models from 2018-2024 use a 5-inch exhaust system as standard, but some heavy-haul configurations may have 6-inch systems. Always verify your specific truck's exhaust diameter before ordering, as aftermarket modifications may have changed the original sizing.

Will these chrome stacks require cutting or drilling for installation on my W990?

Most chrome stacks designed for the W990 are engineered as bolt-on replacements that utilize existing mounting points and clamps. Standard straight stacks and curved stacks typically install without cutting or drilling when paired with the correct mounting brackets. However, if you're changing from a different style (such as switching from under-cab exhaust to vertical stacks), you may need to modify or add mounting brackets. Always check the product description for "no-drill installation" confirmation for your specific model year.

What's the difference between 304 and 316 stainless steel for chrome stacks, and which is better for my climate?

304 stainless steel chrome stacks offer excellent corrosion resistance and shine for most climates and are the industry standard. 316 stainless steel contains molybdenum, providing superior resistance to road salt, coastal environments, and harsh chemicals. If you operate primarily in northern states with heavy winter salting or within 50 miles of coastlines, 316 stainless is worth the extra investment. For most other applications, 304 stainless provides excellent durability and appearance at a lower cost.

Do chrome stack tops/rain caps affect exhaust flow or engine performance on the W990?

Quality chrome stack tops are designed to maintain proper exhaust flow while preventing rain entry. Look for tops with adequate venting slots or curved designs that don't restrict the exhaust outlet by more than 10-15%. Straight-cut or bull-hauler style tops provide maximum flow but offer less rain protection. Curved or angle-cut tops balance protection and performance well. Avoid tops that significantly reduce the stack opening, as these can increase exhaust back pressure and potentially trigger engine fault codes on newer emission-controlled engines.

How do I maintain the chrome finish on my stacks to prevent bluing or discoloration?

Chrome stacks require regular maintenance to prevent heat discoloration (bluing) and maintain their mirror finish. Clean stacks every 2-3 weeks with a quality chrome polish and microfiber cloth. For existing blue discoloration, use a specialized bluing remover product before polishing. Apply a high-temperature wax or sealant after polishing to create a protective barrier. Avoid extended idling when possible, as this creates excessive heat without adequate airflow. Consider heat shields or wrap for the first 12-18 inches of the stack where bluing typically occurs most severely.