Was making 20 pounds....then started going down to around 14, then won't go over 10. Maxed out the boost controller and managed to get around 12 and went back down to around 10.....then removed the boost controller and left the wastegate disconnected...only 10 pounds. No obvious boost leaks...no loud wooshing or anything. When you floor it, it takes a while for boost to come on. No obvious intercooler pipes off...all couplers are tight and look good. I'd think that a large enough of a boost leak to only give me 10 pounds when the can is disconnected would have a pretty obvious culprit.
Car is a 2.5 with Buick GN turbo and 3 core FMIC.