I had to do some searching around, but I finally found a price. It's just under $200.00 for the surface mount version. I think it would be a great way to help you tune your bike for real world conditions. Dyno testing will help you get max HP at full throttle operation, but this would be great for setting up your mid range, and to optimize your A/F ratio for those cruising speeds where you do most of your riding.
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How would you hook this up to your dual exhaust...you need a common point to read all 4 cylinders?
You could either mount on the collector and get all 4 cyls, or (if you are really anal) put a sensor on each pipe, and use a switch to check each cylinder.