Has anybody used one of these on a reasonably  stock  bike  and if so, how was the result. (They plug in line and modify  the O2 sensor reading causing  the ECU to think the bike is running lean, so it richens it up a bit.)

They do work if the bike is stock, less heat and better economy....
What do you call reasonbly stock, hi flow filter is about as far as they go and
the popping starts again when you change the pipes....

Yep work well on stock bikes, mine ran fine with the stage 1 air kit. Popped like hell once I changed the pipes. Still got mine if you want to give set a try.

 Hey Gibbo.  If you want to sell them then I may well be interested.

Only fair to give Beagle first option though, I guess, but let me know.

FR

No worries FR, if beagle doesn't want them they're yours

No dramas beagle, all yours if you want them FR