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You saying back pressure in your experience doesn't cause boost loss, not being able to find a vacuum source, saying it's okay to run 12.6 afr and 17 degrees timing. I'm surprised the car is still running these days.
Can you please explain in short, what did you want to say? Only that you're surprised? There's nothing extraordinary about that if you think about it for a couple of seconds
After rereading pressure sensor scale I learned that pressure drop was almost 7psi actually. So this IC is a total cork in my intake. Will not torture my TransAm with this IC anymore, better IC has to be found until spring.