Add coolant overflow to 225?

The simple answer:

I LIKE coolant recovery. Once the system "equalizes" it prevents air from constantly being ejected / sucked into the system as it cools and heats, and helps prevent rust and corrosion. Plus if you have a large enough "bottle" it can give you some headroom with coolant

Just buy a coolant recovery cap, install a container of your choice, with a hose either coming out the bottom, or entering the top and EXTENDING to the bottom.