i would look into a yoshi or sparks if u wanted to stay with a single. like said b4 alba pipes arnt on the top of the list. i would loose the air box lid and get a good clamp on filter.an rejet. youl be surprised how much more power u can get from just that.
Yoshi, Sparks, CT Racing (my favorite) for singles... then there are duals!
BUT, the difference between what you have and the above isn't huge - you'll notice, but not a whole lot.
What you WILL notice is removing the airbox lid, as Deusen suggested, and rejetting accordingly - 160L/165R mains, 25 pilots, aftermarket needle... I'd suggest the Vito's kit for the jets plus you get extended fuel screws - a real bargain.