I had a banks box too, before modding a intake snail to replace it. A 4 inch cone filter will mount to the cold air hole, I got better boost and everything after that modification. You could get a silicone 90 and some pipe to run the Donaldson there too. The prior owner had that crap kn rectangle filter in it and sucked a bunch of sand into the engine, because the filter didn't seal for snot. You could rtv the top and bottom but have fun pulling it later...
Now I have the intake snail for the boost side, and reused a 90 that was going from the banks box to the turbo intake, I have it going intake to a 4 inch steel pipe, that I attached the CDR to and welded a support leg that mounts to the block or intake (don't remember 100%), with a Donaldson on the end with a pre-filter bag on it. I should have pics on my profile somewhere but it was a great upgrade. Only thing that could be better is pulling the filter out in front of the radiator somehow, make a forced cold air intake.
Honestly at freeway speeds though, I doubt the heat where its at is much higher than ambient, plus the banks box itself would be VERY hot from transferring the block heat. It did make a good table, but it didn't seal for crap on the boost or intake sides, and sucked swapping glow plugs or anything on the fuel side.