I'm here on behalf of my wife's 2016 SV. I've read through every thread I can about exhausts on this forum and I'm still not sure what the best answer is.
Over the past week the muffler popped right off the exhaust flange where it connects to the midpipe. My mechanic took a look and says I probably need a new muffler, and there's no aftermarket mufflers so it'll have to come from the dealer. He can clamp in some kind of pipe over top temporarily, but it won't last very long. Additionally, as far as I could see under the car it looks like the flange has rusted together, so I don't know if the flange from the midpipe could be used again, either:
Other than band-aid fixing it, it looks like my options are OEM ($380 + tax for the muffler, gasket and bolts... didn't even ask about the midpipe), one of the various japanese websites that will get some kind of stainless steel exhausts to me in Ontario for ~$1200, or custom work (and I wouldn't know where to start).
As a possible option, does anyone know if any of the versa or versa note exhaust parts would fit on the micra? There's a lot of aftermarket stuff for it and the pictures look like they'd fit. I could get the muffler, midpipe, gasket and bolts shipped to me for about $390 + tax which is a heck of a lot better than OEM.