I was talking to an old member this weekend 'Mastercraft' at summer nationals and we were talking about headers and o2 simulators. Googled them and only found them for 4.6 5.0 and 3.2? mustangs. Anyone running them on a 05 up 4.0 Sohc or know where to pick them up?

 

You cant simulate the front o2's. The after cat ones can be faked, look for MIL eliminators. They will cost you a few bucks and a used o2 to make them.