FZ1 exup motor and cables

[Seabass]

According to the tuner that did my ECU reflash he reckons they are more than an emissions thing. Im no expert but he talked about exhaust back pressure and resonance etc. Heres a link to another FZ forum I'm a member of You'll see my power graphs and just to point out to you after the remap youll notice a hike on power/torque between just below 4k and up towards 6k. This is apparently where the exup operates. You'll read loads of different opinions online, my opinion is that its there for a reason and not just to regulate noise. 

Heres the link bud: