Just been reading Squadra tuning and it seems the that the Multiair is quite receptive to intake improvements, they are seeing ~ 8hp with open filter, gains stronger in the 5-6k range, so a drop in panel filter will help anyone that is not interested in a drill job

They've also measured the Mito QV @ 163hp, Punto @ 165hp, Giulietta @ 170hp (it has a bigger intake, might try and take a look at one)
Seems they were also able to independently tune the sport switch modes and throttle mapping for the Giulietta probably possible on other models, so someone who can get in the ECU could be quite handy.