Since 99.9% of the time I ride one up, I don’t need the backrest part of the Touring seat. I didn’t buy a Touring with the intentions of carrying a passenger, I bought it for the stability that the longer wheelbase offers. The backrest is in the way of putting a rack bag on. However, the 570 backrest doesn’t just pop out like the XP backrest does. The bracket that holds it in place is also part of the main seat mount, with the grommets that the seat snaps into to hold it in place.
It’s a simple matter of removing four screws to remove the bracket, but you must replace it with another plate. Easy to fab one up and install, and just as easy to put the backrest back on if you ever wanted to. I used a piece of 1/8" aluminum plate, which is plenty since the plate doesn’t really support any weight to speak of. With my cargo bag mounted, it acts as a backrest if I ever need to carry a passenger.
A few pictures.