Porous Media Simulation Guide For FSAE Radiator

Oh, i thought i didnt need a BL at all because its a porous media? I had everything set to slip walls (even the radiator housing) because i want the data from just the porous media. I wanted to do a BMB with only the media but that didnt mesh well. Also do you use the free standing zone faces?

With this off the radiator looks like this
image

With this option ON it looks like a normal volume

also speaking of velocity Profiles looking funny, on the 50 deg media test, i added a housing that tries to influence the flow as llittle as possible. The left arrow is an area of concern for me because this is an anisotropic media and the flow seems to be moving not so parallel with the medium. Is this my error or normal?