I've heard a few people throw this "mod" around on the forums.......what does it do? Where does it give you an improvement? Thanks in advance.

 

it is supose to decrease vaccum pressure by drilling the holes... then make the slide open quicker with a shorter spring...
gives better throttle responce i guess... i plan on cutting the spring a little bit... just to lazy and havent gotten around to it.
but i aint gonna drill my slides...