Let me clarify a little bit on what i mean with the extra o2 bung. This is just off of some reviews I have read, not from personal experience. So it is only a speculation. However, apparently the bung that invidia put in thier dp's will not allow many of the wideband o2 sensors to go in all the way. I remember particularly a post from some guy stating that he had to have a shop custom fabricate the new bung that came with his wideband sensor in another location on the DP in order for it to work.
I dont know, Just something I remember. Thanks for the info though! Cant wait to get my exhaust come early spring. Will open a build thread when the time comes!