If done properly this is a good mod, HOWEVER, there was someone selling these on eBay (and im pretty sure its the same person) with a similar write up, but it also said things like "the butterfly opens up to 100% over the standard 97%, and the potentiometer has been adjusted to give even more top end fueling"

and it was bollucks, MFI RST's don' t have a potentiometer............

And those pictures are very poor...........