in my experience the catch can is most beneficial is in cold weather & not running the engine long enough to get things hot. i had a 15 mustang with a catch can & in the winter i would dump about 3-4 oz nasty milky grey water/oil mix.
they look great...
How are you liking them?
I just got my supercab, I ordered without RB (glad i did) not really liking OEM ones. I really like the RB20 from go rhino but there are none for the supercab yet, so i ordered the dee zee NXT all black from realtruck on friday, i have them coming in...