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.