To be honest, there are many different applications and diferent setups. Just run it like I said fella will be fine. As long as you have breathed the main 2 from the blocks, you are laughing.

Everyone including different tuners, has different opinions and ideas on how to run things, so just stick to what suits your setup best. Bock the vacuum off from the inlet. Jobs a gooden.

I have no idea why the above poster is saying, "it will do absolutely nothing, best not use it"... Tonnes of people have similar setups to this... and a 4 port breather is the most common one.