Firstly this is for camping equipment, but until this gets moved etc...
IMHO Nolans are crap, noisy and leak.
Save you money and buy a C3 Scuberth or a BMW system, if that's too expensive (C3's only cost £250 online) then a Caberg Justissimo (but not the cheap 'trip/Rhino' as that's noisy).
Had 2 mates who brought Nolans, 1 had it sent away to them came back no better. Both were so loud it caused tinnitus for an hour or so after riding and both leaked and filled the pinlock like a fish tank!