I really never found it a big issue even before the kevs mods..as said yer learn to ride around it..
The main trick is to not labour the motor.. keep the revs upa bit..
Only in traffic around the city you notice it... At highway speeds it's gone...
Get the kev's mods and do the throttle mod then it's all but sorted..

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Harley Davidson..
The easyest way to turn gasoline into noise with out the side efect of horse power...