i am running both, the FIM chip is there for the higher rpm limit only. the PCIII has a custom map and runs perfectly. as far as the PCIII is concerned, it doesn't care what chip is installed as it will override any installed chip with it's own settings (canned or custom). as the FIM chips come they're pretty good, providing your mods fit the chip, ie mufflers and filter. to get the fuelling spot on a dyno tune is necessary with either, and in my opinion well worth it.