Best Exhaust option

Just fitted Mugello 225 kit and 30mm Dellorto, have 42mm BIG Bore AF Rayspeed clubman but it is noisy as you like and also seems to be contributing to a bogging down in low gears
Any suggestions for best type of Exhaust to put on there, my my mates running a Gori which seems good but your opinions please
Thanks
Steve
Any suggestions for best type of Exhaust to put on there, my my mates running a Gori which seems good but your opinions please
Thanks
Steve