OK, seems I started a little debate about the whole lean condition thing. I will admit that I'm am no mechanic and to save some face I posted that as a concern that I had read many times. From what I am reading now it looks like the pulleys can be used without a chip. Now how do I go about getting my air/fuel ratio checked out. Do I have to buy the guages or can I have a dealer check it out. My tuner isn't within driving range so I need another way to find out. Soap where do you run your truck at. I would like to run with some other L's in about 2 weeks. Thanks, Jason

 

I think the thing to remember is with out a chip the L computer will richin up the a/f when it gets lean thats what your o2 sensors are for they throw a lean code and the computer compensates. So even if a 4 pound pulley leans out your mix the computer will richin it up untill it is happy and with 42lb injectors I would say it could handle some more boost over stock no problem.