I have a header pipe you can have. It is 'stock' but it has been gutted and there is a 28mm perforated pipe running through the end can. It is much quieter than my leo vince. We can make a plan
Is there no baffle insert for the airage pipe? My leovince came with these baffles that make it a stealth bike, so I threw them away

This guy is selling a full system for R600. Not a bad offer. If you did that I may buy the header pipe of you. I had mine powercoted and it looks shit.
Another option, and probably your best best if a stock pipe is too loud. Go to Jeff Talbott in Pinelands and ask him if he can help you. The man is a wizzard, he inserted the perforated pipe down the middle of my end can for me. Friendly and reasonably priced. 021 5318429