I have a base model sidekick, originally installed by Vohk and has there tune in the bd box and the tunnel dump exhaust. If you don’t want to cut your tunnel, Boondocker sells a muffler that exits out stock location. It came off my 2017 axys rmk 800 but I think it will fit any 800 axys. Complete kit with Vohk’s R1 clutch weights. Runs great, just swapped this setup out for an adjustable one. $2000 plus shipping. I’m in the Cascade/McCall Idaho area.