I'm in the same situation, the best way would be to remove the headers and get the 12mm narrrow band bung mad into a 18mm wideband, but pulling the headers is a pain in the arse.
So, i intend to get the 18mm bung i have, welded about halfway between points B & C on your picture.
What!! Almost 1200$ of exhaust and doesn't even have a wideband bung? Anyway the best thing to do is weld a new bung to the link pipe in the B position. And rememder, Titanium pipe=Titanium bung, a steel one will not work fine.
Unlike US, Euro models (and I belive AU models too) gen 4 came with O2 sensor, so the link pipe had the bung to install the stock sensor. Since on gen 5 the O2 sensor is in the headers, the link pipe bung is not more needed for normal operations. Considering the fact that many people install autotune or similars, a pre-installed wideband bung is a great move, that many manufactures did, but not Akrapovic.
I spoke with shop who does custom exhausts. They can't weld titanium but could easily copy titanium link pipe to stainless steel one with 18mm bung. If price reasonable I go with this option. Will see tomorrow.
ordered the M4 link pipe at work just to see it but does not have tabs to put slip on with springs. looks as if it have to be a clamp style slip-on attachment. and I have the M4 street slayer now that has the bung but im switching to a different exhaust that does not have it on the mid pipe
Looking at an SC-Project exhaust but does not have an O2 bung on the mid pipe, so id need to get one welded on
way old thread but I figured I would comment for those who are still dealing with this, you can get an aftermarket midpipe that is stainless steel and weld the bung, buy a mid with the bung already welded or you can carefully drill out the old bung for the narrow band and tap it with an m18 thread tap and screw the wideband right it. be careful as the walls of the old bung will accommodate but not if you don't drill it straight through. midpipes are cheap vs a new header
Got a Scorpian link pipe the keeps the cover trim plate on the cat. Getting it welded about halfway just below the footrest. Woolich also said there is enough metal to drill and tap the original 12mm O2 sensor hole on headers for it to fit there if you want too may help someone too
Will post a picture of it next week as mates at British Superbikes this weekend
yeah thanks. I just noticed many questions about this around the forum so thought may as well bring it back up, scorpion and two bros mid pipe are both stainless steel so easy enough to have welded. but the o2 bung can easily be drilled and tapped too. thanks for the pic
Mate made a very neat job here is a bigger picture the sensor sits below the foot rest
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