Thread: Head Swap?
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Old 11-10-2010, 10:39 AM   #6
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Join Date: Dec 2003
Location: Ottawa, ON
Posts: 1,876
Originally Posted by Beemer p.i. View Post
Hfm is a cold-air intake, isn't it? I have that already with a K&N cone filter
No, HFM is hot film meter, basically the MAF, sits between the intake and Throttle body. Stock your engine comes wit ha 3" one. The 3.5" one is needed to support higher flow, and is mapped differently. Again, need sftware for all this, or its a waste (except the m50).
2007 BMW 328Xi Touring, 6 speed
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