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The ECU tune is available from Gintani / OE iTuning in Van Nuys, CA. They've done quite a bit of work on N52s and have reliable upgrade software for the different flavors: 3.0i = 328i and 3.0si = 330i and 325->330 conversions. I took my 3.0si to them for a reflash and, though the gains were modest, am pleased with the results and would recommend them as a reliable tuner for N52 based BMWs.
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