I've just installed the three mods, HMF full exhaust, k/n intake and the PCIII. I have the 15t sprocket ordered but it hasnt come in yet. I went and rode it after I uploaded the map for my setup, and when I let off the gas I have a backfire. I'm not to sure what to change on the pcIII so if you could direct me accordingly that would be great. I think I was expecting a little more out of it, but could it be since im running through the gears so quickly it doesnt seem as fast as it should? Anyways it sounds great and I love the look of the exhaust..