Wehrli 03-07 Dodge 5.9L Cummins 3.5in Intake Horn & Driver Side Intercooler Pipe Kit - Gloss Black

If you're looking to get the most out of your 2003-2007 Dodge 5.9L Cummins, especially when pushing more boost, upgrading the intake horn and intercooler pipe is a smart move. The factory plastic intercooler pipe and restrictive intake horn can become weak points, especially on modified trucks. This kit from Wehrli Custom Fabrication directly replaces those components with a robust, high-flow setup designed to handle more air.

This kit swaps out the stock 3-inch plastic intercooler pipe for a heavy-duty 3.5-inch aluminum pipe, which is mandrel-bent for smooth airflow. The factory intake horn, often necked down significantly, is replaced by a full 3.5-inch elbow. This elbow is welded to a CNC-machined flange that mates perfectly with the cylinder head, and it even includes two 1/8" NPT ports for boost gauges or water-methanol injection. It also retains the factory oil dipstick tube and wire harness routing, making installation straightforward. The entire assembly is finished in a durable gloss black powder coat.

Included with the kit are high-quality 5-ply silicone boots and stainless steel t-bolt clamps, so you won't need to reuse any old, worn-out rubber parts. This is a bolt-on upgrade that doesn't require any tuning, and it offers about 60% greater flow than the stock setup. It's a solid way to improve the breathing of your Cummins engine.