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hmm never heard of someone with a mitsubishi big16g seeing less than 10 psi with hooking it up directly to a vacuum source, I saw about 11-12 psi.
Maybe b16g's do come with a 12ish psi wastegate (I guess it makes sense when the goal is to use higher pressures anyway when upgrading)? I know the stock DSM turbo's are gated around 7-8 psi, unless they magically increase whilst on DSM's compared to on a Honda