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The M5 numbers to be inflated. While the 540i will dyno rwhp closer to bhp. From what I have seen new M5's dyno closer to 315 rwhp new, they give a generous drivetrain loss percentage for bhp. Some manual 540i get around 300 rwhp with the ECU upgrade and supporting mods. roadfly.org has a ton of good info on both.
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