Photo 2/17 | 002 Stealth Module | The Stealth Performance MPG Series Module includes everything needed for simple installation on 6.7L Cummins-powered ’13-to-’17 Ram trucks.
Photo 3/17 | 003 Stealth Module | Stealth Performance recommends leaving the engine off for at least 10 minutes before installing the module. After the prescribed amount of time, the batteries are disconnected and the injector-harness plugs are removed. A screwdriver is used to release the locking tabs on the fuel-rail plug, engine harness (front), and flywheel harness (rear).
Photo 4/17 | 004 Stealth Module | With the fuel-rail plugs disconnected, the Stealth module’s wiring harness is installed. The plugs on the new harness are labeled for easy installation.
Photo 6/17 | 006 Stealth Module | The new harness simply attaches to the stock plugs with OEM-style connectors. Two male and female connectors are used to complete the circuit. Once connected, the plugs and harness are easily routed for a clean installation.
Photo 7/17 | 007 Stealth Module | Once the engine wiring is in place, the module’s plug is placed in the location on the firewall where it will be mounted.
Photo 8/17 | 008 Stealth Module | The selector switch is then connected to the harness. The switch can be installed in the cab or the engine bay. We’re leaving it under the hood. There are four performance settings that can be selected: Stock, Low, Medium, and High.
Photo 9/17 | 009 Stealth Module | Finally, after all the connections are made and the harness is in place, its power and ground wires are attached to their respective terminals on the driver-side battery. Once both batteries are reconnected, we mount the module box to the firewall behind the battery, removed from any intense heat.
Photo 10/17 | 010 Stealth Module | After installing the module, road testing for about 50 miles gives the computer an opportunity to adapt to the new settings.
Photo 11/17 | 011 Stealth Module | The truck is secured to the dyno and the first run is made with the module set on the stock ECM calibration. In stock trim, Mike’s Ram makes 327.6 hp and 627.0 lb-ft of torque.
Photo 12/17 | 012 Stealth Module | We then switched to the Low setting and saw a healthy improvement to 352.3 hp and 648.8 lb-ft of torque.
Photo 13/17 | 013 Stealth Module | Big Joe Granatelli operates the dyno at GMS. The Stealth MPG Series Module’s medium setting yielded 377 hp and 663 lb-ft.
Photo 15/17 | 015 Stealth Module | Little Joe Granatelli is the man at the throttle for our dyno test.
Photo 16/17 | 016 Stealth Module | On the highest setting, the Stealth Performance Stealth MPG Series Module raised the stock 6.7L Cummins’ power and torque to an astonishing 389.9 hp and 917.6 lb-ft of torque. The 290 lb-ft boost in torque is very, very impressive for a plug-and-play programmer, and it can be hidden inside a truck’s engine compartment or cab and does not leave a “footprint” in the ECM whenever it is removed (in theory, at least).
Photo 17/17 | Stealth Module Joe Monitor | Stealth Module