i have been running a II 120 over pump since 2010, been perfect, never missed a beat, running II twin turbos on the tow truck, s366 over s483, 60,000 miles later, perfect!!!!! have been running II injectors for 3 years in all trucks, as well as the trucks here at custom auto, i think its clear how well our trucks perform??!!! People think that they need 30,000 pounds of rail pressure, WRONG I run no more than 24,500 pounds of rail, if your told otherwise, well......., turn your pumps and fuel systems down guys, its hard on everything, the pumps and injectors dont need that high rail, you wanna run good product, treat it like wise!!!!!!!!!!!!!