2013 sti stg 1 cobb ap aem intake and Gs aos are my mods, Ap and aem intake using ots 93 map. My boost gauge will only read about -6 vacuum on idle and builds boost very easy with little throttle applied. I just noticed it started doing this recently. I can reach my target boost of 18psi. And the defi boost gauge im using reacts really slow while reading vacuum. It use to be very quick. The ap will only read about -6 to -10 on vacuum while at idle and stays around -1 to -5 vacuum while maintaining a steady speed on the highway. It use to be around -19 at idle and around -15 on the highway. Cant find a vacuum leak either.
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