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

When you're looking to get the most out of your 2003-2007 Dodge 5.9L Cummins, improving airflow is a key step. This kit from Wehrli Custom Fabrication addresses a major restriction in the factory setup: the stock plastic intercooler pipe and the cast intake horn. The factory components can limit how efficiently your turbo can push air into the engine, especially on modified trucks. This kit replaces those parts with a larger, smoother-flowing system designed to help your engine breathe better.

The heart of this kit is the 3.5-inch mandrel-bent aluminum intake horn and the matching 3.5-inch intercooler pipe. This is a significant upgrade from the stock 3-inch pipe and the restrictive factory horn, which necks down considerably. The larger diameter and smoother bends mean less turbulence and more consistent airflow to your cylinder head. The intake horn features a CNC-machined flange that mates directly to the WCFAB Grid Intake spacer for optimal air distribution. It also includes two 1/8" NPT ports, perfect for adding boost gauges or water-methanol injection systems, and a dedicated port for the factory oil dipstick tube and wire harness clamp, keeping your engine bay tidy. The intercooler pipe is constructed from heavy-duty 14-gauge aluminum, offering a strong and durable replacement for the often failure-prone OEM plastic pipe.

Everything you need for a clean installation is included. You get high-quality 5-ply silicone boots and stainless steel t-bolt clamps to connect the pipe to the intercooler and the horn, so you won't need to reuse any old, worn-out factory parts. The entire kit is finished with a durable WCFab grey powder coat, giving your engine bay a clean, custom look. This is a bolt-on upgrade that requires no tuning, making it a straightforward way to improve your Cummins' performance and reliability.