That hole between the two sides looks to bypass the air filter completely. Not sure I'd do that.
Opening up the intake hole worth a try I guess. Why not just leave the cover off and ride it and see if there is any improvement? If there isn't then all the holes are for nothing. Same with filter, try it both ways, no change then keep the filter.
I'm a believer in trying stuff but if I can try stuff without permanently changing it then I don't have to buy stuff to start over. Then again I'm a cheapskate but I do like to mod things! Nothing I own is stock!
Bottomline is have fun as thats what counts.