MAF vs ATS Help

[millerdigital]

I have a 2005 6.0 PS, and only found little bits of info out there that perhaps my stock air filter did not have a Mass Airflow Sensor (I'm missing the part of my stock air filter kit that would determine this easily - go figure).
Looking at the K&N instructions I see there is a step that says "3a ... On vehicles equipped with air temperature sensor..." then in a next step it says "3b ... On vehicles equipped with a mass air sensor..." This leads me to believe that it is one or the other, if my vehicle indeed has an ATS then likely did not have the MAF ?? Or am I reading into this wrong ?
Also if my truck did not come with a MAF sensor, I do see the harness that would plug into the MAF and the plug itself looks clean as if it was plugged into something but not 100% since an aftermarket shop did the install and is not being very helpful.
Any help or advice on how to tell if I'm supposed to have one would help, and would it hurt by getting one and adding one to my KN setup if it did not come stock with one? (running really bad cold)

[m-chan68]

Early build 2005 model years didn't come equipped with Mass Airflow sensors, but yes the connector for one was in fact there. FYI, on vehicles equipped with a MAF, IAT #1 and the MAF are one-piece. To add one isn't going to achieve much more than needlessly wasting money because you would also have to get a PCM from a later model year 2005 vehicle as well.