Per google ai - it looks like the PP radiator is used on the PP mustang, Mach 1, GT350 and GT350R.
If correct then it should help everyone with cooling.
I put the fender arches and the GT350/GT500 S'wing on my Mach 1. I do not like the wheels or the overbite lip on the handling package. I wish there was a middle package like how I set it up. The only reason I would have bought the handling package is if I tracked it everyday.
You got lucky it came installed then because I was reading a lot of people that bought the Mach 1 with the handling package came with that not installed and other parts like the fender arches not being installed.
i am surprised handling package owners keep the overbite lip. If I would have bought the Mach 1 with the handling package that would be the first thing off.