RE: 2001 Dodge Ram 1500 4x4 5.9L
I would ask him if he added that at the same time as another add on, or what motor he has. It has worked somewhat on the V-6, but the way the intake is designed on the 5.2 and 5.9 there is no way a throttle body spacer can perform. What spacers actually do, or in theory do, is as air goes through them it causes that air to spin. Now in other designs that can work, because as that spinning air leaves the spacer the spin can be held through the intake runners to the valves. The intake design of our motrs is such that the air leaving the throttle body or the spacer as it were enters a huge chamber full of seperate runners, but nonetheless a large empty chamber. There is no possible way the spinning effect can hold up under those conditions. A friend of mine has a v-6 Ranger and I can defintely tell the differance after he installed his spacer. It just scientifically does not work on that motor. Hope this helps.