I had a hard time finding compatibility info for the PCIII so I thought I'd share my findings with the community. Some of my findings may be wrong so feedback is appreciated. (I have installed a PCIII USB intended for a '06 VFR800 on my '99 VFR800 and it's running great.) Facts: 1. It appears that all years of VFR800 use the same PCIII USB hardware (Model # 111-410 I believe) 2. All that's different are the maps, even the firmware on the device seems to be the same. 3. The plugs on the PCIII seem to compatible with all years of VFR800 4. You can download the latest firmware, maps and enhancements from powercommander.com without cost or registration. 5. There is a new enhancement for the PCIII (USB Only) called Accelerator Pump which allows the PCIII to respond differently according to how you are using the throttle. It works on my '99 so it should work on all VFR800s. 6. It appears that the cable length may differ according to which bike it was intended for, but it still fits. The reason I ended up with the wrong year is that it was a good deal on eBay. As far as performance goes, it's great. I've had a PCIII USB on my CBR1100xx for a while and appreciate how smooth the power is. With the PCIII installed on the VFR800, it too is noticeably smoother and easier to ride. The accelerator pump is a nice bonus and definitely makes the bike feel more lively during spirited riding.