Hi, I bought a used Speed Twin with X-Pipe installed and I'm looking to replace with the OEM catalytic converter Can't find anywhere, thanks.
World of Triumph have schematic for a Speed Twin. Go to worldoftriumph.com and look but it is kind of expensive.
It might be worth checking if the Thruxton 1200R cat is the same part number. Many parts are interchangable between the two models (I've just taken the spoked wheels off my Thrux and they fit your Speed Twin). I've also de-catted it, so if it does fit, I have one available....be aware that (on the Thrux at least) it's a bit of a nasty fiddly job, (YouTube it), and personality, I think the bike is much improved with the x-pipe, so I wouldn't refit the cat.
May well work, I have put the Thruxton exhaust pipes on my Speed Twin and think they look and sound great.