Are you still running the stock down pipe and cat. If yoy are then your cats might be clogged. Before I changed out my down pipe and cat with an after market test pipe and down pipe my car would not boost past 6 psi. After the parts were replaced my car peaks at 8psi ( 1 psi over stock). Start there if you have already replaced the cats then do a boost leak check, you might have a leaky I/C pipe/
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