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I have a n75 J valve. With all my mods im spiking too high and hitting limp. With the new custom file simon put in, it changed my timing for my FMIC. However I with my MBC set at 17-18psi I dont have any surging problems at all, but I will hit limp mode if I hold any gear past 3500rpm (only if im not on full boost this will happen)
2008 BMW 135i | M Package | JB3 | DCI | BMW Performance Exhaust
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