Originally Posted by Dakar Dan
Ah-ha. Think I ran myself into problems recently by running the overflow tube upwards to the airbox, which kept it dry but of course didn't allow it to drain properly. With the lower end: is the split to act as a valve of sorts (ie. sucks itself closed under vacuum) thus "inhaling" through the top arm instead? And why the diagonal cut?
The split and the diagonal cut just makes it harder for 'stuff' to clog it up and block it. Either on their own helps, both is better. The diagonal cut increases the area, and the split makes the ends loose and they flap a bit which dislodges shit trying to get itself in there. Not a perfect solution, but better than the square cut they all come with stock.
Standard stuff for breather and overflow hoses.