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Wow, if this was using Dinan's dyno, the S55 stock is in fact significantly underrated (even assuming a 12% drivetrain loss) as Dinan uses a wind-tunnel simulation (why the S65 dynos higher at Dinan). Dinan uses a 15% standard gets you a 484 crank, which seems a bit high. I don't know about enforcement of EU regulations, but based on the dyno and assuming a 12% drivetrain loss (vs 15) you still get 460 bhp.
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