Hi guys, where can i find deails on Swona exhaust systems for NC

Long since defunct mate, Graham formed Mercury after Swona but has since closed doors on them as well.
All hand built, very good, very hard wearing.
The Swona system was developed on my race bikes back in 2001/2002. What info do you need?

Cheers Aly. Have now got one. Full system twin stack but havnt seen one anywhere. Needs a little bit of tlc so wondering if it's a worthy project.