I have considered this mostly because it would be nice to get Touratech pannier mounts more symmetrical so you could run the same sized box on each side. It would look and sound pretty cool too. I'm wondering if you had a small crossover pipe (probably a good idea anyways) if you could stick the O2 sensor in there. Or does it need to be more directly in the stream? Otherwise going with 2-1-2 is probably the best option. Would like to try to fabricate with catless headers.
2013 BMW F800GS, Cordoba Blue, ASC, ESA, ABS
2012 BMW G650GS - 13,000 miles ***SOLD***
"If you're not mixing gas, you're not hauling ass!"
"A clean GS is a dirty shame."