Do I need to drain coolant before swapping this in?

Yes. Drain your system completely before removal. Refill with BMW-spec coolant and check the level after the first drive cycle.

What hoses and clamps are included?

This is the radiator core only. Reuse your existing hoses and clamps if they're in good condition; replace them if they show cracks or hardening.

Will this work with my current thermostat and water pump?

This radiator is designed to work with factory components. If your thermostat or pump are original and over 100k miles, consider replacing them at the same time to avoid premature failure.