I need some help / opinions on the use of PCV breathers in the modern hemi. Those with BT catch cans seem to be collecting lots of gunk. Seems to me these breathers would let the air out, and keep the gunk in... wherever that is. I can see the benefits of keeping the gunk out of the intake, whether it be with a catch can or breather... I just don't know if there is any harm in not letting the gunk out by using a breather. Is there any harm in the use of these breathers??? Please drop any and all knowledge on me. I know nothing on this topic.