Theres the Hornet option, high pipe each side maybe thats what you have seen, it similar to the A10 high pipe but fits A65. Dont know if it will fit right on a metisse , maybe need a tweak here and there.
71 Devimead A65 750 56 Norbsa 68 Longstroke A65 Cagiva Raptor 650 MZ TS 250 The poster formerly known as Pod
Hornet pipes are option. I can only find a handfull of pictures of metisse with bsa twins and they all (appart from mine) have been fit with Hornet pipes.
Looking in the Metisse book there is an advert for a 165 metisse and it too has hornet pipes. Looks like I will have to fabricate a bracket but that isn`t a biggy.
I also recieved a photo from a guy on facebook who has fit spitfire scrambler (A10) pipes on an A65 and he said he needed to cut the pipes 2 inch at the end (which end!) but I am now leaning more toward the hornet pipes.
Looking through videos on you tube I think I have to find some discreet silencers to bring the noize level down a little.
The big thing to quieten bikes when I was a yoof were VW beetle tailpipes. I fitted them to my A10 for the open pipe look, a nice snug fit in the pipes and I held them in with a short self tapper. What could go wrong? It was absolutely strangled, a H**da 50 could have out run it It is a sad fact of life that to quieten a bike without losing power requires a big silencer. The standard "elephants leg" silencer on my Aprilia RSV Mille makes more power than most of the "performance" systems available