Pretty straight forward, I put Cobra Speedster Slash Downs on a couple of months go. First quirk is get new exhaust gaskets. I tried reusing and had leaks that made for very impressive backfiring. Second quirk, check the flange on the pipes as mine had a weld that needed to be ground flat to make a good seal.
Follow directions and order of tightening carefully, make sure you tighten the flanges before tightening the clamps that holds the mufflers to the head pipes. If you reverse it can make getting a good seal difficult.
While many say no need to jet when you put the pipes on, I did have to open the PMS
up to about 2.5 turns (stock was 1.75 turns out). The scooter ran great, but hot so I went for the air kit right away. Set up is 06 R*, Sea Level, Main
Jet 170, Needle fourth groove, PMS 2.75 turns out. Get the Barons PMS Adjusting Screw, makes it easy to tweak.
I put the BAK
on and love it. The Twin Velocity is good, but it sticks out further and my leg hit against it. I tired it on a friend 04 R*. The BAK mounts in nice and tight and gives you back the room your stock unit was using up. Both are quality units and will improve the performance.