Maximize 
17217519215 power steering cooler
Models 5' E60/E61 520i/523i, 525i M54/N52/N52N/N53, 525xi, 530i M54/N52/N52N/N53, 530xi/545i, 6' E63/E63 630i, 645Ci, cars with active steering, look at link fittings for your car (Online ETK)
Original part
