I have the V&H Power Duals (got rid of the cats), Hi Output slip on's and stage 1, with a PCV and I am very pleased. I bought the PCV and stage 1 kit through FuelMoto, pre-programmed and installed myself. Had a little ping after the pipes were installed, but Jamie at FuelMoto was great and we tuned it with just a few adjustments. Either way you go you will be very pleased. The bike runs much cooler and response is great! No need for a Dyno as FuelMoto has the PCV's preprogrammed spot on.