Personally, unless your planning on carrying a passenger (I can't imagine why you would on this bike) it is unecassary. An option to make it look better would be to trim and paint the alumunim face black and leave the mesh natural. Another option would be simply to add a couple of button head allen bolts to cover the nut up and call it good. Another option would be to simply install the Leo Vince cat eliminator for $225 and run the stock header and mid-pipe with the slip ons.
I guess that shit looks good if you are from Italy.
Out!