BBK & E84...
 

Considering the E84 N55 is marketed with this "brake regeneration" nonsense will a Brembo BBK work or am I forced to stick with these brakes? they seem to have the strength of the people portrayed lowry paintings and I would really like to install a much better performing and looking brake system.

I don't know why you call it nonsense, it seems like a good idea to me.

Brake Energy Regeneration also has nothing to do with your brakes. The braking comes from the alternator, which applies a load when you are coasting or decelerating, thus converting kinetic energy into electrical energy. It is controlled by the accelerator pedal, not the brake pedal.

You also likely have other brake features such as brake pad drying, but that is part of the ABS actuator, and shouldn't have anything to do with the calipers themselves. You may find that some pad compositions work better than others given these types of features.

First thing to do is consider alternate pad compounds before changing out calipers, IMO.

Is the braking limited by the brakes, or the tires?

it has everything to do with your brakes...

"For regenerative braking, a power converter fitted directly within the brake system converts the energy generated upon application of the brakes into electric power."

the reason for my interest in the brake upgrade is because this is my "project" and i plan to extract a great deal of power out of the motor and will need to upgrade the brakes and suspension to support it.

Not sure where you got that quote but it's just plain wrong. The only energy generated by the brakes is heat.

The X1 turns the alternator off during acceleration to increase mpg. It's more like regenerative engine braking.

i will contact brembo directly to see if they make a product for this platform.