Oil Breather Filter

on a similar note, the pcv valve on the back of the rocker cover... what happens if you block that up? and could you put filters on all of your breathers?
 
I too have wondered about the crankcase vent...

Mostly I wonder if not having them running into the airbox helps performance as you haven't got hot manky air spoiling your otherwise nice cold feed?

There's a lot of banter about induction kits and panel filters but not much I have seen on the PCV side of things...
 
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