easy mod, keeps oil from being sucked into the intake- I/C system... do a search, there are an ASSLOAD of posts about which is better... breathers vs. oil seperator.
Bright ass blue thing in the upper left corner. $14 Wal-Mart Jobbie. I did it withing 18 hours of buying the truck. Works ok. There is a $100+ one that has a return line. I'm working on a return line for this one. Search and you'll find part numbers as well. Very simple to do.