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You were on the stock plugs still with all these mods, and then you changed to BPR8ES after this problem began, and nothing changed?
Other than ignition (plugs, coil packs, or plug wires) or a huge boost leak, there's no reason I can think of for the car to start sputtering as soon as you try to hit full boost. To rule it out, I'd swap plug wires with another Evo - that doesn't take very long.
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11.51@117.72 - PMI
11.62@116.60 - Bandi
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