i cant say if there is any gain in power or not as i never had teh twin carb setup
this is my first shee and it had the single on it when i got it
but its def a huge improvement in adjustablilty
u can pop offf the seat and get to the carb top to play with the height of the needle
and to change a pilot is as easy as loosening up the clamp and rotating the carb around
the main jet you dont have to do a thing jsut pop off the plug in the fuel bowl and swap it out
it couldnt get much easier
and NO TORS to deal with