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dont know about the other system,spped was with gp system.but its was on slight down hill so dont expect to get it all time.tony at wrc was getting better speeds than me but he has bigger tyres on his and is smaller and lighter than me.

Hi i´m trying to know how much HP did you get from the gp exhaust. did you note the difference between the original and the gp?¡ what about the HOWLER?¿?¡ i love it did you whach the video, the noise is awesome!!!!?¡ Bye, answer me soon please!

hi,
i only gained a couple of bhp at best with the gp system, never tried the howler!does sound gooooood though . as you can see from pic i have ventured away from cbr to the new yam but if you have any questions about power etc im sure tony can help you out or i can tell you as much as i know from my experimenting.

i know they have altered the gp system slightly since i had it and made the header slightly smaller to improve performance,needed more back pressure.