I'm with the other guys, don't think that bit needs removing. Memory evades me but think I tried to remove it as well and also got stumped haha, but found i didn't need to anyway.
Its a case of battling the wires and shoehorning them all back in to get the headlight and fairing back on. Take your time, keep repositioning them until they fit without pinching, its not fun & will take a while.
Personally I do feel it made improvements to the low down fuelling, enough to warrant keeping it installed if not planning to go whole-hog to get it remapped etc.
It's not as smooth as a jap 4cyl, never will be, but I can now at least take on a mini roundabout in 1st gear without looking like a tit about to drop it with choppy fuelling.
So whether you notice much difference may depend on the roads you ride.