Hi Faktor,
1 Gut the OEM muffler
2 Purchase 2" perforated tubing to use as a core
3 Bore a 2" hole in the OEM end cap (This will in the process remove the ugly little turned down snout that is covered up with Carbon Fibre)
4 Expand one end of the perforated core in order to slip over the OEM collector outlet located deep within the muffler housing
5 Attach a suitable outlet and spigot (in order to slip the opposite end of the perforated core) to your modified end cap
6 Install the core / pack with suitable material and affix end cap
I have indeed performed such a modification. Be advised It is quite involved, however in the final does prove of benefit as due to the size of the OEM canister noise is not excessive and the fit remains that of OEM.
Perhaps Husabomber and / or Enforcer4 would be so kind as to supply pictures?
Hope this helps.
Kind Regards,
Dale