I personally think it's more trouble than it's worth. I bought my 919 with one already installed. I'v removed it and installed it several times. When it is installed, I don't notice an increase in power, or a smoother power delivery. I do notice that my bike doesn't start emmediately like it does when the PC3 is not installed. I had it removed for a year and a half, and I installed it just for shits, and it wouldn't run unless I held the start button in. Maybe I just need to reprogram it... I just got the cable to reprogram it a few days ago, so as soon as I get off my ass I will. There's maps out there that you can load according to your setup. Stock air filter, aftermarket air filter, full exhaust, slip on's of practically all brands... In my opinion it's too expensive for a mod that will cause more headaches than happiness. If you already have great riding gear, I think the next step is great tires, then trackdays till you need more tires.