As liquid said only for the Accelerator pump to work, but still playing with it.(and maybe a quick shifter).
The Accelerator pump will only be noticed on the zero map because if you are using say the 501 map which is already giving 20odd% more fuelling the extra fuel as well from the pump will not make any more power! it will more than likely loose power as over fuelling.
It may work with Wally's map as it's got some low values.
I have based my fuel percentage increases for the pump on the average % increases on some of the common maps available.
An Fjr owner from Japan has been using it and is very happy, but he has a UK model bike which may make a difference but cannot see why!
Also if using the Zero map only the mpg goes up, One of our members is regularly getting 50+mpg and thatís down the back lanes.
Give it a try it only take a minute to load..