I know of at least one local to me making that sort of power.
As do I, thing is, would it actually be that great to drive and be a nice ownership experience over say a half decent e46 M3 that was designed with such power in mind in the first place?
Having been a huge fan of 300 - 400bhp Cosworth Sierras back in the day and driven a fair few, I wouldn't entertain one over a scruffy,leggy e39 M5 for example.
I've always found modded cars are more about headline power bragging rights rather than being good - in the main - to own & drive.