well, some progress made. I hooked a separate boost gauge to one of the turbo outlet housings and took a drive. That shows 15-16 psi at the turbo, before the intercooler, and the in-dash gauge and map sensor both show 10 psi at the intake plenum.
So there appears to be a big restriction in the intake system, or a huge boost leak. I think the intercooler is fine as it was on the car before without issue, but it's a definite possibility it's restricted or plugged somehow. Possibly the big 90 degree angle coming right off one of the turbos (required to clear) is affecting it, but I've had right angles on the pressure side before. Maybe the boost is pushing past the o-rings on the sheetmetal intake.
I need to get a longer piece of hose and hook the gauge to the other turbo and see if it's different. The intercooler will be a pain to remove, most of the front end stuff has to come off (grille, bumper, etc.).
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