Darkside Developments also tested this and posted a video just a week or two ago. Surprisingly accurate and within a few horsepower to their actual dyno readout.
Not a cheap tool though at several thousand dollars, and quite fiddly to setup properly.
I’ll stick with a $100 dyno run at my local Mainline dyno, but its a smart gadget none the less. Certainly a lot cheaper than a proper dyno setup.
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