I dont know where u fetch ur facts from but ur engine specs are totally incorrect. cbr250rr dishes out not 23 but 40bhp.
As far as the exhaust note goes....... youtube some cbr250rr flybys...... u'll understand what i mean...... no fancy exhaust tip can produce that.
Comparing CG125 n CB125:
almost the same engine........ maybe for untrained eye it is almost the same...... for me....... they are different. One is OHV while the OHC. CB125's are fragile with their OHC engines......whereas CG series can take far more abuse......... CG series was developed by honda for third world countries like us so obviously a CB125 is an acquired taste and a rare sight. I personally love its DUG DUG sound.
U msged me about the cg-125 alteration........ dude.... dnt do it........ that freind of mine u were refering too almost died....... he broke so bones in his body i cant even count. its a miracle he recovered ALHAMDULLILAH but not everyone is lucky.
SAY NO TO ALTERED BIKES