Looks good, but you are likely losing power with that setup due to the hot air the engine is sucking in from right behind the radiator.
It is all about Air Density. For example, a stock 6.9 (421 ci) running at 2500 rpm and operating at 85% volumetric efficiency consumes 258 cfm of 75 deg. F air. The air will have a density of 0.074 lbs/cu-ft at that temperature, at sea level (you guys in Colorado are just screwed), and 21% of the air is made up of oxygen, the magic chemical we like to mix with fuel to make noise in an IDI. Doing the math gives you 4.022 lbs of oxygen to mix with the fuel each minute. That amount of oxygen is directly proportional to the amount of power that can be produced.
Lets say that your intake increases the volumetric efficiency of your engine by 10% to 95%, but you are now drawing in 200 deg air from behind that radiator rather than 75 deg ambient air. Doing the same math as above, but knowing that 200 deg air has a density of 0.060 lbs/cu-ft, you end up with only 3.639 lbs of oxygen to burn with the fuel each minute. That would equate to a 10% loss of power, or 15 to 18 hp in a NA 6.9.
I would look at extending that tubing and filter out to a wheel well or other location that has air at or near ambient temps. I know, easier said than done with a van.
If you don't take my word for it, check out many of Gale Bank's videos on the topic of air density and diesel performance.
https://official.bankspower.com/density/
