Drilling out exhaust ?

[Dinger1962]

Hi chaps recently became proud owner of a 2006 fz6 so far have put set of pirelli corsa diablos/renthal bars/puig double bubble black screen jus lovin it.My question is havin looked on youtube and seen how to drill out rear collector box does this not affect mapping /breathing for bike and has anyone tried it oh and does it improve performance cheers Stu  

[BBROWN1664]

does this not affect mapping /breathing for bike

Uhm, let me think. Freeer flowing exhaust. Reduced back pressure. No, doubt it will make any difference apart from spoil the standard exhaust. Your better off buying a different can. At least that way you can put it back to standard for the MOT or when you sell it.

[Dinger1962]

ok thanks