Hi everyone, I am installing a GReddy Type-S BOV (Modified by RRE) as we speak, but I have a question:

My BOV came with a rubber hose, do I replace the vaccum hose that came stock or do I use the new small rubber hose to connect to the hat of the BOV (The purple part)

 

either or...as long as its connected to manifold vacuum. i used my "stock" hose though...

 

Also is everyones vaccum line in front or behind the radiator hose?

 

Behind gives more power.