Wehrli 03-07 Dodge 5.9L Cummins S400 Twin Turbo Kit (No Turbo) - WCFab Red

If you're looking to significantly increase the power and efficiency of your 2003-2007 Dodge 5.9L Cummins, this twin turbo kit from Wehrli Custom Fabrication is a solid option. This kit is designed to work with an S400-style atmospheric turbocharger and your stock Holset turbo, creating a compound setup that can support up to 1000 rear-wheel horsepower with the right supporting modifications. It's a popular choice for daily drivers and tow rigs that need more grunt without sacrificing too much low-end response.

Wehrli has put together a well-thought-out package here. The hot side piping and downpipe are coated in a high-temperature ceramic to help manage heat. You'll get a 3-inch cold charge pipe connecting the turbos and a 3-inch crossover pipe for the hot side, along with a 4-inch downpipe. The kit includes silicone boots and stainless steel t-bolt clamps for secure connections, plus stainless steel oil feed and drain lines. It even retains your passenger-side factory battery location, making installation a bit more straightforward. The kit comes with a dry air filter and an Outerwear's pre-filter cover for added protection.

This kit is designed to give you improved horsepower, better fuel mileage, and superior Exhaust Gas Temperature (EGT) control. Wehrli offers several recommended turbo combinations to help you dial in the performance you're after, from a quick-spooling S475 setup for around 750 RWHP to an S480/67 for over 1000 RWHP. Keep in mind that the specific turbocharger is not included, so you'll need to select one that matches your build goals. All the necessary installation hardware, including V-band clamps and heat wrap, is included to get this kit bolted on.