As far as I've read - 40psi, but the MAP sensor can only read up to 25. Which the PCM reads boost from the MAP sensor.
Don't quote me on that, but that's what I've seen and what I follow for pressures - and my turbo hits pretty dang close if not over that. I haven't done studs yet but it's likely coming.
Stock turbo is a different story, but supposedly it'll hit 35 - I would recommend a new turbo if you're going for those numbers though
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