Update - aFe's 3.5L (edge/Explorer) Intake kit, "fits" the MKZ 3.7L!
While subjective, and probably not what Lincoln intended with this car, the sound is incredible. I love it, and have even received some compliments from a few friends. Only when under medium + is the intake audible. Light throttle sounds throatier and deeper, at WOT, is is loud, and it really screams near redline. Not going to make any claims for power increase, but it feels slightly more responsive in mid range. The mustangs seem to show gains on dynos with just intakes, I would imagine this car to be similar, again no claims here. The fun factor has increased substantially for me. and I am happy with the sound.
Once tax season subsides, I will spend some time making a custom heatshield. The Edge kit is designed to work with the bottom section of the oem airbox. While the engine bay arrangement is similar between Edge/MKZ, the airbox is different, so the supplied cover was not used from the kit. I was able to retain the OEM air ducting section of the intake, and the rest of the kit bolted up fine. I need to extend the PCV hose so that I can reinstall the engine cover. Other than that, install was straight forward and took about 20min taking my time. The heat shield will need to provide some sort of mounting surface as the intake is currently "Floating" in the engine bay without the airbox to rest on. I have temporarily secured it with ties to keep it in place.
Two pics for now, I will start to fab up a homemade heat shield in the upcoming weeks.