They are crap, but you can run a cone filter off the intake hole going to the cold air hose.
Assuming you meant the huge rectangle box. They dont seal up for crap between the air filter, turbo, etc.
Meaning Boost leaks, and gunk getting past the filter. I used an ats intake snail to adapt to my banks turbo, and built a 4inch intake with one of those huge 6637 filters hanging off. Then a 4 to 3 elbow to the turbo inlet. You can also run a cone filter, the cheap ones at autozone will catch more than the banks box n kn filter. I put my cdr on the 4 inch pipe too. I can work on my engine now too. If I want to remove the intake for some reason it's 1 bolt and 1 clamp, instead of the dozen or so bolts and multiple clamps to even tinker around lol.