I installed my 1st PCV today on a GSXR750 -08 model.

So 1st off, the PCV can work on older model bikes, as long as the connecter are the same as the new model bike. I am convinced that you can make the PCV work on any model XT660. The older models without the O2 sensor will require that you drill a hole in the header pipe and have the bug welded into place. You get the bug with the auto tube unit so most engineering shops can help you with the drilling and welding. Note the Welding needs to be airtight.
There are a lot of new features on the PCV that you don�t get on the PCIII. For example, the unit I work with on the GSXR has engine temperature and gear selection input and some even come with input to detect intake air pressure and so forth. This enables you to run a fuel injection map per gear instead of one map for all gears. On a lot of the modern bikes the ECU delivers different amounts of fuel and ignition timing for each gear and with the PCV you can map the fuel to address problems in specific gears. You can even go as far as making a different map for each gear per cylinder. In other words if you have a 4 cylinder bike with 6 gears you can build 24 different fuel maps and the PCV will know when to use which map without rider input.

Throttle calibration is also a lot better and another feature I like is that you don�t need the bike to be running or use a 9v battery to power the unit. It draws power directly from the USB port now and you can programme the unit without the bike running.

The auto tune unit is another great add on, but in the wrong hands it can cause damage to the bike. The PCV can now increase fuel delivery by up to 200% where the PCIII could only do 100%. If you get things wrong you can drown the motor and cause serious damage. When you run the autotuner, you better get it set up by someone who knows how it works

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Disclaimer: any mod undertaken, are carried out at owners risk