They both work in the same way, changing the fuel maps for the bike, the Pc111r, has an additional timing option, but as I stated above , unless you do something like raise the compression ratio, you wont see any benefits from the the PC111r. So to answer your question, they both work in the same manner. No difference in performance between them. If I'm not mistaking, they are eventually going to make only the PC USB, but I could be wrong....425R1 said:WHICH ONE AM I GOING TO GET THE MOST PERFORMACE OUT OF???