What i've gathered from upgrading wheels and expecting a difference in performance is that you probably won't notice it. Unless you're going from a really heavy set of standard wheels to ultra light wheels cuz if all you're changing is the wheel diameter, then i think you're looking at zero perfomance upgrade. OR More likely if you go to a wider wheel you'll have more of noticeable difference in the car feeling planted and gripping around bends. If you do upgrade, i wouldn't vote for you to go for Nissan or Mazda wheels on your sportivo - i just find that disturbing. Also, if it were me and i paid for new low springs, id wanna complete the look with some new wheels regardless of whether or not it improved my performance.