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Powerchip and ESS both have strong reputations, and they're very close in terms of power. I'm personally thrilled with my Powerchip tune with 10K miles on it. Couldn't go wrong with either for your big, heavy vert. ;^)
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M850i Vert with RaceChip
E46 M3, Euro Headers, Rasp Pipe, Kassel Tune
Alpina B8, zero performance mods
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