Wehrli

• Intercooler pipe kits make up most of the Wehrli catalog. They replace factory charge pipes and outlet elbows with larger diameter, mandrel bent aluminum tubing, commonly 3 in. or 3.5 in. depending on the truck and side. You'll find full kits and individual pipes, such as a single passenger side pipe or an outlet elbow kit. Wherli intercooler pipe kits.
• Turbo kits include compound (twin) turbo kits that add a larger turbo in series with the factory or a stock-style turbo. Compound setups are popular on diesel tow rigs because the small turbo keeps response quick while the large turbo supplies airflow at higher rpm. Wherli Turbo Kits.
• Turbo install kits contain the hardware to mount a larger single turbo, such as an S400-frame turbo, on a specific engine. They commonly include a pedestal, up-pipes, downpipe, intake, charge piping, and oil lines. The turbo itself is often sold separately. Wherli Turbo Install Kits
• Turbo upgrade components are the individual parts behind those builds: T4 pedestals, high flow up-pipes, turbo intakes, and related brackets and housings. Wherli Turbo Upgrade Components
• Intercooler kits: Wherli Intercooler Kits

Which trucks do Wehrli parts fit?

The current lineup covers Duramax LB7, LBZ, LMM, and L5P engines, the 2003 to 2007 5.9L Cummins, and the 2017 to 2025 6.7L Power Stroke. Fit is specific to engine and model year. As an example: A 2020 to 2025 L5P pipe will not fit an LBZ, so use the vehicle filter above.

• Start with your goal. Replacement intercooler pipes are a common fix for leaking boots or cracked factory pipes. A compound or big single turbo kit is a much larger build that commonly needs tuning, fuel system upgrades, and transmission work.
• Check what a kit includes. Turbo install kits may exclude the turbo, and some kits require a related Wehrli part to clear the larger intake. Read each product's notes before ordering.
• Match the color across your build. Each powder coat color has its own part number, so order matching colors if you're buying pipes and kits separately.
• Plan for lead time. Some kits are built to order, especially when you supply your own turbo.

Common problems Wehrli upgrades address

• Boost leaks at the charge pipes. Factory boots and pipes can loosen or split under higher boost, causing low boost, black smoke, and reduced power.
• Restricted airflow on modified trucks. Larger charge pipes and intakes commonly reduce restriction once a truck runs more boost.
• Turbo limits on high power builds. When the factory turbo runs out of airflow, a compound kit or larger single turbo is the typical next step.