Frequently Asked Questions About Kenworth W990 Elbows, Piping & Comp.

What material are these exhaust elbows made from, and how long can I expect them to last?

Most W990 exhaust elbows are manufactured from either aluminized steel or 304/409 stainless steel. Aluminized steel elbows typically last 3-5 years under normal conditions, while stainless steel options can last 7-10 years or more. Chrome-plated elbows offer excellent appearance but require regular maintenance to prevent pitting. For maximum longevity in harsh climates or heavy-duty applications, we recommend 304 stainless steel components.

Will these parts fit my specific year Kenworth W990?

The Kenworth W990 was introduced in 2018, and most exhaust components are compatible across all model years (2018-present). However, there can be variations based on engine type (Cummins X15, PACCAR MX-13) and wheelbase configuration. Always check the product description for specific fitment details, or contact our team with your VIN number to ensure proper compatibility. Some aftermarket modifications may also affect fitment.

Do I need special tools or professional installation for these exhaust components?

Basic exhaust elbow replacement can typically be done with standard hand tools including wrenches, sockets, and potentially a sawzall for removing old components. Most installations take 1-3 hours depending on the specific parts. However, welded connections, complex piping configurations, or components requiring alignment adjustments may need professional installation. We recommend having exhaust clamps, hangers, and high-temperature sealant on hand before starting any installation.

What's the difference between OEM and aftermarket elbows for my W990?

OEM elbows guarantee exact fit and typically use specific Kenworth part numbers, but often cost 30-50% more than quality aftermarket options. Aftermarket elbows from reputable manufacturers often use the same specifications and materials as OEM parts, sometimes with improvements like better corrosion resistance or enhanced flow characteristics. The main differences are usually price, warranty terms, and occasionally minor dimensional variations that don't affect performance.

How do I know what diameter and angle elbow I need for my truck?

W990 exhaust systems typically use 5-inch diameter piping, but always measure your existing components to confirm. Common elbow angles include 45, 60, and 90 degrees. To determine the correct angle, trace your exhaust routing or use a angle finder on your current setup. Stack configurations may require different angles than under-cab exhausts. If replacing multiple components, consider purchasing a complete kit to ensure all pieces work together properly.