I'm looking at one of these high performance brushless motor kits. Not a bad price considering everything you get and the quality. Plus from what little I've read, they're very quite, reliable as heck, (50,000 hours claimed life). They also have a soft start feature to go easy on the electrical side of your car. You can also buy just the fan. Controller is a digital Ecu that allows you to control speeds/load. Some peeps on the Interwebs are running these on their bblok hotrods with positive reviews. Should keep an m54 nice and cool and dialed in.
Brushless Fan Kits
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2005 X5 3.0, 6MT, Alpine White on Truffle Brown, Sport, Preim, and Cold Weather, Alpina Stainless Headers, AFe Intake, UUC SSK, OEM 87's, 3.64 Differential Swap,Performance Modified Euro 2 Tune, UUC LTW Flywheel and HD clutch, Bilstein B12 Suspension kit 
Future mods ZHP/Schrick Cam Shaft upgrade, Operation code name: Doppelschrauben-Kompressor
Wife's Ride: 2011 e70 X5 351 M///Sport.
Also in the fold: 2004 X3 3.0, 6MT, Black Sapphire on Terracotta, port, Premium, Cold Weather.
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