Thread: Head Swap?
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Old 11-10-2010, 10:39 AM   #6
ScotcH
6th Gear Member
 
Join Date: Dec 2003
Location: Ottawa, ON
Posts: 1,876
Quote:
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).
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