592 horsepower to the wheels. As this is a pre-facelift W212 E63 model that is to the rear wheels and not all four. That is a gain of 119.5 wheel horsepower which we will just round up to 120. With additional bolt on modifications and race gas 600+ at the wheels sure looks within reason. Keep in mind those numbers vary based on the type of dyno used. This particular graph is on a Dyno Dynamics with an unknown correction factor but the ~600 whp range is well within the realm of expectations on your local friendly Dynojet.
Great gains here from Eurocharged and combined with their well known aggressive pricing their tune makes for one of the best performance values in the M157 aftermarket.