I have cut open tons of air boxes. The first effect is more intake noise. Some scoots respond better from an open box alone, But yours won't. Opening the box, and going up 2 jet sizes will help with all around response. You may also need to go 1 step hotter on your plug to keep the burn temp. up. You can remove the baffle to get a more grown up tone from your scoot, and that may be enough of a bite to get you into moding the cvt for instant punch. That would be the best place to look for performance gains