Peterbilt 379 Elbows, Piping & Comp.

Frequently Asked Questions About Peterbilt 379 Elbows, Piping & Comp.

What are these elbows and piping components used for on a Peterbilt 379?

This category covers exhaust system components, primarily the elbows, straight piping, and connecting pieces that route exhaust gases from the turbo or manifold up through the stacks. They are used to build or repair the exhaust system, connecting sections like the turbo outlet, muffler, and vertical stack pipes.

How do I know which elbow or pipe size fits my truck?

Peterbilt 379 exhaust piping typically comes in a few common diameters, so you will want to measure the inside or outside diameter of your existing pipe before ordering. Also check the angle of the elbow you need, such as 45 or 90 degree bends, since the wrong angle can cause fitment issues at the stack or turbo connection. If you are unsure, comparing the part number to your truck's build sheet or reaching out to our parts specialists can help confirm the right fit.

What materials are these parts made from, and does it matter?

Most elbows and piping in this category are made from aluminized steel, stainless steel, or chrome-plated steel. Aluminized steel offers good heat resistance at a lower cost, while stainless steel and chrome options provide better corrosion resistance and a brighter, longer-lasting finish, which is popular for visible stack sections. Choosing the right material depends on whether the part is hidden under the frame or visible as part of your stack setup.

Can I install these parts myself, or do I need a shop?

Many elbows and pipe sections are a straightforward slip-fit or clamp-on installation, and experienced owner-operators often handle this themselves with basic tools. However, sections that require welding, cutting to length, or precise alignment with the turbo or muffler may be easier to have installed by a shop, especially if you want to avoid leaks or improper seating at the joints.

Will new exhaust piping affect my truck's emissions compliance or sound level?

Replacement elbows and piping that match your original exhaust system's diameter and routing generally should not affect emissions compliance, since they are not altering the aftertreatment system itself. That said, always avoid removing or bypassing any required emissions components, and check that any new piping does not increase noise beyond your state's regulations, particularly if you are running open stacks or a modified setup.