Read point 1 from my first post in this thread.Originally Posted by 06stibeast
Slightly rich (~9.5:1), and for < 1 secondOriginally Posted by wrx0131
Please explain this to meOriginally Posted by wrx0131
Unless you're running meth on your vehicle, you will probably not reach the limitation of the OEM BPV with the VF39 (judging by your username, I'm guessing you have an '06 STi). With that said, if you want a BOV, get one (just pick a good valve and ensure it's setup properly, like Tial). Is it necessary? No.