Wehrli Custom Fabrication Engine Air Intake Housing

Wehrli Custom Fabrication Engine Air Intake Housing: Diesel Airflow Done Right

When it comes to squeezing every cubic foot of air into a high-performance diesel engine, few names carry more weight than Wehrli Custom Fabrication (WCFab). One of the most respected names in the diesel industry for precision-engineered, high-performance upgrades, WCFab is known for show-quality powder-coated components and race-proven performance. Their engine air intake housings sit at the center of that reputation — purpose-built enclosures that govern how cleanly and efficiently air reaches your turbo and combustion chamber.

What Sets WCFab Intake Housings Apart

WCFab's high-flow fabricated aluminum intake pipe, intake horn, and air box enclosure with dry filter assembly replaces the restrictive plastic factory parts on your Duramax Diesel for improved engine performance and sound. That's not a minor upgrade — the factory airbox on most diesel trucks is a significant bottleneck, and WCFab's solution addresses it with purpose-engineered geometry from the filter enclosure all the way to the turbo inlet.

Airbox lids are constructed of 10-gauge aluminum sheet, minimizing air restriction and flowing significantly better than stock, while the fully enclosed design keeps the filter protected from dirt and engine heat. A removable airbox lid element allows for easy visual inspection and maintenance of the WCFab filter, with an included hydrophobic pre-filter cover to help keep the MAF sensor, turbo, and engine airways contaminant-free.

Engineering Details That Matter

The all-aluminum system significantly increases airflow to your turbo, producing improved horsepower and torque, quicker throttle response, and cooler intake temperatures by drawing cold air through the hood Ram Air duct and inner fender. All-aluminum construction features large-diameter 4" piping with precision CNC-machined bead rolls, improving intake air velocity and volume while providing a more aggressive engine and turbo sound during acceleration.

Products like the L5P Duramax high-flow turbo intake horn boast a 27% increase in flow, proving that function and form can coexist beautifully. The intake horn is over an inch larger than the OEM diameter and improves air flow to the turbo by removing restriction found in the factory horn right before the turbo inlet.

Broad Platform Coverage

At its core, WCFab is dedicated to powering Duramax, Powerstroke, and Cummins trucks with rugged, high-performance parts that meet the real-world demands of hauling, towing, and racing. Their air intake housing lineup reflects that commitment — covering generations of GM 6.6L Duramax (LB7, LLY, LBZ, LMM, LML, L5P), Ford 6.7L Power Stroke, and Ram Cummins platforms so that diesel owners across the board can benefit from the same level of airflow engineering.

Bolt-On Simplicity with Custom Flair

WCFab intake housings require no tuning — they are true bolt-on upgrades that fit on a stock truck with no other modifications or upgrades necessary. The full assembly is finished in your choice of WCFab's signature custom powder coat colors for a look as unique as your truck. Every product is proudly Made in the USA.