Installed Pypes catted x, CEL for cat efficiency

Ok so the other day I installed my pypes catted x. While installing noticed that the 2nd o2 on the stock h goes in the middle of the pass cat. on the pypes x theres 2 holes before the cat, and in the cat there is a bung with a blockoff in it. however it is too far from the stock location to be able to stretch the sensor that far. So i just threw the sensor before the cat, figuring a cel would probably appear. Sure enough Friday night the CEL popped on for cat efficiency below threshold. Are there extension harnesses to put that one O2 on the bung after the cat? BTW as a side note, I LOVE the car after installing my JLT, Brenspeed tune, and X, car is an animal now.

Thanks, very helpful. I suspected that is what I would need. I ordered it from blue oval industries, they didnt even include an instruction sheet, which wouldve been nice since I needed to cut 8" off the manifold to cat part of the pipe to make the cats fit and didnt know this and called them up like an idiot saying their part didnt fit. Probably wont be doing business with them again.