If you are considering doing this mod then this exhaust packing will make life easier Silencer Packing Material by Thermal Velocity
Just started on mine.........not worried about rattly rivets.... ......if they get into the main pipe when I remove the end caps (they fall from where they are stuck on the end of the packing) I just blow them out again at 3000rpm.... .......any stuck on the packing will fall out when I pull the outer tube off.....any in the packing will get junked..... I'm glad mine are straight through though....no baffle plates, nuffink..... AL
I make a feature of doing the conversions. £250 incl. post. Like termigoolies but cheaper. And legal...................
I'm sure there was a long and detailed thread on here where someone had cored there zorst and used this stuff.