Diff Breather extensions are an essential modification if you plan on doing any kind of water crossing when touring in the outback. Even if you don't plan on going through much water, diff breather extensions allow you to keep the breathers in a high area out of the way of dust, and other grit. The aftermarket diff breathers available on todays market are very good quality, and have afilter element which keeps the air clean and eliminates dust that will destroy your diff gears. A very small investment in some breathers will save you a lot of hard work later on. The best thing is, you can install them yourself!