If you are this confident about the result it sure will be over 450 hp/crank. I think 1M can make 500 hp and 500 lb.ft of torque without changing turbos at crank even if you play it safely. If you want to break records you probably can go a bit higher but not much.
But I am saying this just because I like betting not because I have experience in tuning
So that's my guess, 500hp and 500tq crank.
By the way, did you want to say N55 mids among the actual mods list?
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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.