Originally Posted by Airhead Wrangler
You already have a breather. The bolt holding your plug in has a hole down the length of it. That's the stock breather. Or you could replace it with a solid bolt and switch your plug to one of these:
Bumping this thread up...
Does anyone know where to get this breather stateside? I am wanting something a little more refined than the cork I've been using for a while. If I order from bmwboxersupplies.com it's €25,60 just to ship it to Dallas and the part itself is only €16,39.