The changes you should notice are first a broader powerband, and more power overall, throughout the range. It helps give more power but really is a help to riders of all ability levels. It's one of the aftermarket items that helps and is just too expensive a mod to have as a standard item. the titnaium also will keep the temps down from steel. They are well worth the cost.
I forgot to say, no, there are no changes you need to do to fit the Mitani pipe at all.
Cheers m8