Coffee houses give you these itty bitty straws to drink through and that doesn't cut it for me. I need all of my speed beans pronto. Well, the intake on your 2007.5-2009 Cummins is the same. You've got either a 3 or 3.5 inch outlet on your intercooler, but only 2.4 inches of plastic tubing feeding your intake from the intercooler. That's an inch diameter restriction, and well, that dog don't hunt, so make a change. The Glacier Diesel Power Boost Tube Kit will cure your tiny straw blues. Featuring either a 3 or 3.5 inch coupler from your intercooler (application depending) and a full 3.5 inch mandrel bent and powerder coated boost tube, you remove the unecessary restriction between the intercooler and intake manifold letting the engine breathe all the air you can muster.
Some aftermarket intercoolers feature either a 3 or 3.5 inch outlet, so take a moment and double check your size requirement before ordering.