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Cotbu is on point!
I just recently had this issue about a week ago! I installed a boost gauge, and I was getting a reading of 18-20psi. I would let off the gas right away of course.
I installed a NEW Hks adjustable wastegate, and problem was fixed!
It seems that the WG goes bad with age, and mileage. I have about 100k on my motor, so yeah.
Also the benefit of the Hks WG is that it's adjustable, so you can set it up to 14psi.
But you should have it around 11psi, safe.
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