The annoying thing about the ORP is its a 50/50 shot its not the ORP and its your header. I went through 3 used headers I had laying around trying to put stock exhaust back on a car and all 3 were bent. 2 had the tell tale dent in the one primary the 3rd looked flawless but its hard to put an o2 sensor in when the header has the o2 bung in the cat pushed under the oil pan.
I got everything from Dom in I think about a month give or take and I love the suspension stuff it fits and looks great.
Unless he got help he was a 1 man show last I checked so you just need to deal with that fact when you order parts.