5g lighter only by changing the stock battery compartment´s cover with the new carbon reinforced cover. There´re also all the other lighter K&KK parts that came with it yet to change. Besides, these parts are quite more rigid than the originals.
Still on weight savings, another 88g saved after switching from a Nanotech 5.3 hardcase 2s battery, to a lighter 4000mah soft case 2s Skylipo. Unfortunately, I´m afraid that only hardcase lipos are allowed for competition.