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another thing u can do that will get rid of boost creep is get a o2 housing that has a wastegate dump. but these are loud as hell and you will sound like a F16 at full throttle
when there is too much exhaust gasses to go through a small wastegate hole, it builds up so much that boost controller is non effective. it happens when you strap on a bigger exhaust system or get a bigger turbo without upgrading the wastegate or getting an external wastegate.