Dodge HEMI Ram 2500 Truck (Square Port) 2002-2008 Long SystemWhen the stock power of the Hemi Ram 2500 is not enough for pulling serious weight. An ARH header system is exactly what you need to increase torque up to 30 ft. lbs. and Rear Wheel HP up 25 (before tuning). The durability of the 2500 series Ram is well documented, and of course, the powerful Hemi is the motivator, But even that may not be enough for pulling serious weight. An ARH header system is exactly what you need to increase torque up to 30 ft.