the r32 gtr calipers are 4 pot brakes. so definately an excellent gain to be had.
disc size = 324×30
but some shaving of the disc is needed.
there is a good write up on pga about the r32 brake upgrade.
whats needed, is new calipers, new brake lines, new discs(have to have these machined, and correct stud pattern drilled), pads, and your all set.
probably a cheaper option than the brembo upgrade, but i'd be looking into it from your end. its been done here before, on n14's, n15's and n16 pulsars, all using the n16 hubs, which are a direct fit to the n14s and n15s for others interested in this.
disc size = 324×30
but some shaving of the disc is needed.
there is a good write up on pga about the r32 brake upgrade.
whats needed, is new calipers, new brake lines, new discs(have to have these machined, and correct stud pattern drilled), pads, and your all set.
probably a cheaper option than the brembo upgrade, but i'd be looking into it from your end. its been done here before, on n14's, n15's and n16 pulsars, all using the n16 hubs, which are a direct fit to the n14s and n15s for others interested in this.