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Message: <blockquote data-quote="IanDaddy" data-source="post: 25572" data-attributes="member: 18207"><p>I have done some reading lately and found the following,My E46 325i M54 comes with 2 fans (electrical aux fan and a mechanical fan with clutch)Saw a few E46 318i N42 - 1 Electrical puller fan onlyFriend's E60 M54 - 1 Electrical puller fan onlyFriend's E90 320i - 1 Electrical puller fan onlyRead that E46 MT comes with 1 Electrical puller only.The mechanical fan , once engaged it is very noisy as it spins along with the engine RPM. When you rev from 1000 to 3000 rpm it sounds like an airplane taking off. I read that some with Steptronics have replaced the aux fan and mech fan clutch with just one electrical puller fan, no problem. It is plug and play , the connector simply plugs into the aux fan harness.I think electrical fan is superior because first it spins at variable rate but independent of the rpm (unless you like the engine roar). It also free up the load on the engine ( you can feel when the fan clutch is engaged when you rev from stand-still). Any chance the sifus here know the CFM (cubic feet / minute, I think) ratings of the mech and electrical fans ?What are the experience of the OM and forumers ?</p></blockquote><p></p>