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Discussion Starter · #4 ·
Get this. Air Oil Separator for WRX/STI
It's the best way to go according to my tuner. I'm putting mine in when my new PW intercooler gets here.
I'd get the KillerB unit if it were me.
Talked with a couple of tuners and everyone has there own thoughts. I just needed up getting a catch can for the PVC side for now, will do CVV side later. Tuner told me both are good to run, But AOS just put that nasty oil back into your oil pan, therefore it's better to do a catch can so it just doesn't go back into your engine bay
 

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I just installed the IAG AOS over the weekend. Build quality is top notch. Install is a royal pain in the ass but thankfully you only have to do it once. There are 53 steps to the instructions :eek3:. For me it was well worth it. My EGR and TGV deletes will be here tomorrow, among other things, so it was a necessity.
 
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