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I have an MBC fitted, however this has been wound all the way out to its lowest setting.
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Before I replaced the cat I was hitting 10psi with the mbc, and before the mbc I was hitting 7 max.
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The cat was absolutely ruined.
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My guess here is that the mbc's stock pressure is about 15psi(?), but I've seen other people
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I also have fuel cut disconnected and the VSV.
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