Now if I could just find one that is just one range colder. Wouldnt yours be two ranges colder? Im running 605's right now and I tried the 104's I believe it was and the were too cold for my engine. We are very similarly modded except the 3.4. I have an MPS on the blower, but I have a 3.8 pulley on there for now. I got a 3.4 ready to go once I can scan more.