I don’t recommend venting the crankcase to atmosphere. I still believe that part of the tuning/idling hiccup in the BP turbo kit is due to not having those hose plumbed back in preturbo. The TT kits route that back to the intake piping leading to the turbo. I think the ECU is expecting a certain amount of unmetered air at the TBs and when it doesn’t get it, it causes small issues. Nobody has been able to confirm this because there is no way to plumb the hose preturbo on the BP kit.
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