If you use a 2003 to 2007 Dodge truck with the Cummins 5.9L engine to tow your RV, the Wilson Thrasher intake manifold is designed for you.
According to Wilson Manifolds, the Thrasher manifold improves EGTs (Exhaust gas temperatures), improves torque, and improves fuel mileage on the Cummins 5.9L engines.
Depending upon the state of tune, the Thrasher can generate in excess of 300 extra ft-lb of torque, or with lighter throttle use, the equivalent in fuel savings. In contrast with the OEM arrangement, this new induction system provides greater equality of air-fuel distribution, especially in the cruise zone of 2,000 to 2,100 rpm.
As a result, the Thrasher generates not only amazing gains in both torque and fuel economy but also improves horsepower output, lowers exhaust gas temperatures, reduces exhaust emissions, and improves drivability.
Check out the results from the strict disciplines of the dynamometer graphs below. One graph demonstrates the gains in both torque and horsepower of the Wilson Thrasher manifold when compared with the OEM manifold, both of which are tested with a standard ECU. In the other, both are tested with an aftermarket ECU.
What is more, the greater the power improvements made to this engine, the greater the performance or economy benefits of the Thrasher. In simple terms, the Thrasher requires less accelerator pedal action to pull, tow, or cruise; therefore, it uses less fuel
Source: Wilson Manifolds