I am currently running 560cc evo 8 injectors in my setup. I am upgrading to Precision 780cc injectors(for a little more cushion room). The insulators are pretty rough, so I wanted to replace them. What size do I need? I am running a skunk2 intake manifold, if that makes any difference? Anyone know? I just want to make sure I am good to go for tune date in a few weeks here....