Dale......(IMO)...When I was younger, I use to throw a K&N air cleaner on everything, until I realized that they pass a lot of dirt and just make more noise. That system that you linked to, will just make more noise under hard acceleration and probably do little to improve air volume.
You've got the last of the big killer engines. I would look at ways to force more cool air into your current air box. Often the snouts are routed into a fender well to pick up air. See if you can add an additional hose and force air from the grill into your air box. Keep in mind that you don't want it out where it will easily collect water.
On my old Ford E450, I was able to route the air cleaner snout down to the grill and put a screen over it.
Lastly, I believe that motor does well with the addition of long tube headers. Headers can be a pain, but do make significant power increases.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab