On a side note, if you're replacing the radiator, double check ahead of time to see if you have the crimp on hose clamps for the small coolant overflow hose which runs along the top of the radiator and into the expansion tank. You'll want to replace that with a screw-type hose clamp (which BMW should have used in the first place...).
1998 BMW 328is
1966 Pontiac GTO
2007 Subaru Impreza 2.5i 5-door
View my photos: Caught in the Wild