There all easy to fit, just two bolts to undo to remove the oe can. With just an end can replacement you don't have to touch the exhaust valve.
I've a remus on mine, I like the fact that it has no silencer strap to hold it on, it has s proper bracket as they have broke with me in the past. I've had a fuel exhaust to but found it loud, not greatly finished and made the bike spit back and stall more but that was pre new ecu. The scorpion is a nice can, just check the pannier clearance if you have them as rhe end of the scorpoin sits a little higher than most.