just did a motor swap and had extra ignition coils from my 03 600rr
.gsxr buddy needed coils so i said try these after noticing they (03 cbr and gsxr) looked identical on ebay..
we switched the rubber boots on the coils and found they work!
so heres a tip in case you didnt know...
03-04 gsxr 600/750/1000 ignition coils and 03-06 cbr 600rr ignition coils same, just got to swap the rubber boots

ignition coil replacement fixes loss of power issues at 7-8 grand rpm.
my buddies gsxr was cutting off at 8 g.. now its fine