So, my "old school train of thought" has me thinking about removing the valve cover ventilation breathing tube that re-inserts hot oily air back into the air inlet piping and going with a filter off the valve cover OR one that has an oil baffle and screws into the oil cap threads instead. Anyone else try this yet or does this effect something I am unaware of? I know how valve cover ventilation works (and emissions) but I also know that this can make your intake and intercooler a "dirty" mess (and everyone knows lowering intake temps is a good thing too). I've done this on a few different cars and it didn't hurt anything. Your thoughts? CFM Baffled Billet Valve Cover Breather Kit for 2013 Focus ST/ST250 Wondering if this would screw into the FiST oil cap hole (as a direct fit or is the FoST & FiST oil caps different?