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Homemade induction kit.... breather filter question



Hello all
Right I've bought all the bits for a ktec style homemade induction kit but my question is what size breather filter do I need ?
I've searched on here and seen everything from 13mm to 25mm so a little confused.
Thanks it advance :)
 
  Mk3 clio 1.5
that normally refers to the width of the filter opening, depends on what size hose your using, measure the width of the hose that your using to connect to the block or if its feeding of the main. Maybe a pic of your setup would help.
 
I don't have the car to hand as its having a lot of work done and at the garage so sadly can't measure anything up. It's just the standard oil breather hose coming of the airbox I was going to put a crankcase breather on
 


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