hi, i also have a r125 in black, their is 3 exhausts on sale for the yzf at the moment, the micron, which everyone has seen or heard of, the Leo Vince which looks very small and doesnt look that good but apparently has good performance and the Rossi
replica type exhaust which is made by an individual bike garage, cant remember where i saw it now but it didn't suit the bike. for the moment i am going to wait a couple of months until more come out becasue the bike is relatively new so all exhausts haven't been tested throughly. also more will come out becasue it is such a popular bike, highest seller in may, so all exhaust manufacturers will want to cash in on this. hope this helps!
p.s whats the top speed you've got to so far?