indeed, thats a weird header design. found a similar header online, A&B Header Pipe that is. how did you go about with your install?

 

i just cut that piece out with the sensor hole in it and had it welded up to the exhaust, i should have just had the exhaust shop weld one in so i didnt have to cut up that stainless steel but oh well its done now

 

I wish someone would post some pics of the modification from a single to the dual (where they cut and what they had to change). I am waiting on these headers and plan to cut them up to make them work with my new dual exhaust.