What Ian said. Plus, it won't mean a lot to you anyway because none of those posted results will be equal to what your car would do on the dyno that really matters, the one that you have modded results. So, my advice you better give it a rest and just accept to live with an estimate.
Of course, unless you wanna tear down everything you put on the car including the tune and realize a stock run on that same dyno and re-install
Seriously, these seem to be your only options. I would go with the estimate.
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"The mark of a great car is one whose overall competence exceeds what you should expect from its individual components and the 1M does just that", Chris Harris.
BMW 1M-SOLD-: TECH: Evolve Race+N55mids, Evolve IC, Michelin PSS, ER cp, aFe filter, CDVx, Vorshlag camber plates, BMS OCC EXTERIOR: trunk spoiler, blacklines, black grills, IND goodies INTERIOR: Alcantara steering wheel, steel pedals, custom mats, MPower e-brake.