about 3in1 MvC2, CvS2 and 3rdS

[MrQ®]

Hi, I've just got this awesome Jeffma 3in1 comp. , and i noticed , indeed, that the cd size is almost 2.6gb or sth like that....i was wondering if i can change the music of the 3 games, but without getting over that "default" size, and then making a Cdi file, no matter how much big would be, would it fit into the cd?...or is there a way for just burning this comp. with the X_ Y_ and Z_ folders and not the mixes?
or if i just do a game with all mixes but not getting over the 2.6gb, would it be like a 700mb cd anyways? my adx files aren't too big.