personally found that the v&h packing that came in the kit wasn't enough - wasn't long enough to cover the full baffle, and didn't fill the can space sufficiently
contrary to the above, wrapping it tighter makes the can more straight through, and will make it louder, including if you wrapped the baffle with the copper wire sheet.
personally got some additional packing sheets and double wrapped the baffles closely but not tightly. this also holds the baffle in place stopping any reverb. dispensed with the wire sheet
had the bike sound tested on the track days before and after. was about 102/103 dbs with one packing layer, and 98dbs with the 2 (which is still loud, but means i can do the quiet track days without having to change the exhausts)
doing the race cans comes with a degree of noise, but there's a difference between a bike sounding powerfully loud, and making noise for the sake of it.