When my PCIII was hooked up, I had zero popping - ever. As soon as I removed it I started getting some popping, not a lot, but some on decel at low speeds - 45mph and lower, and some when simply holding a steady speed, or trying to hold a steady speed, while going down the street, again at low speed 45 and below. Without the PCIII, it's also not easy to hold a steady speed below 45mph. I get sputtering, coughing and popping. It's annoying. At speeds of 50mph and above there are no problems. I removed my PCIII because I was experiencing some other issues that was corrected only by removing the PCIII but I am thinking about putting it back on, and trouble shooting other things again.
2003 VTX 1800R