Hi Tony,
Happy New Year.
That's a really neat solution, I won't hold my breath but will be waiting for a full write up (LOL)
I've seen cheap anemometers on sale around $40.00, obviously not best quality but if repeatable results would be OK for a yes or no on flow improvements. (pretty sure they just use something like a 2 wire computer fan and measure generated voltage?)
I used flow bench a few times when I taught at MMI (Motorcycle Mechanics Institute, Orlando) Superflow 110. Not sure how accurate it was but it did show improvements (or otherwise ;( )
Reading Vizard's work/books over the years I suspect he isn't burning any bridges but doesn't think 10" pressure drop extrapolation is best way to go?
Got some good results for a semi-pro MX'er on his YZF250, he jumped about 30 spots in national ranking
3yr old is sleeping at present, I get a lot of time to think trash but not much time to actually do anything (plus watch too much You Tube)