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My m235i has below mods custom tuned. Turbo drops about 1-2 PSI after 5.5K RPMs but timing makes up for it some. Im now shifting a bit early after noticing it, around 6.3k or so. Get a DP and custom tune from JordanTuned on BM3 and you should be doing 480hp easy. You can even run e60.
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