I have Ethos chambers on my MC21, Scott... unfortunately the bike's in Holland, and I'm in the UK! I'll drop Rene a line and see if he can measure them for you if you still need the info?
Having said that, I think it's highly unlikely the TYGA manifolds will work. The chances of them being both the same OD and same length as the Ethos are very remote. Let me know if you still need the info.
Drop Racer38 a message if I don't get back to you quickly here, as I'm not on much at the moment as I am flat out with work and the new website, and he can WhatsApp me.
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Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.
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