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Old 03-17-2006, 05:54 PM   #1
1st Gear Newbie
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Join Date: Feb 2006
Location: quebec
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Question M3 1999 Maf

I have a MAF with 3" diameter (stock). I saw in a place a swap of the MAF 3"1/2 and the trottle body more bigger. It's is true? Good Mod? What is the model is this?

Last edited by carbon; 03-17-2006 at 06:00 PM.
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Old 03-17-2006, 05:58 PM   #2
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Is it from a e39 540? you sure you're not talking about the HFM?
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Old 03-17-2006, 06:03 PM   #3
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No, on the Air Flow Meter (MAF)
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Old 03-17-2006, 07:42 PM   #4
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Yes, its a popular swap. You have 3 options in terms of the MAF:

- Euro M3 (3.5 " MAF)
- e39 540 MAF (same as above)
- Dinan (same as above but more $$)

You can get your TB bored out as well... it will improve your throttle response. Contact Randy (Empowered) on this board as he can do this for you. He'll be doing 6 for me soon Dinan also has a bored out TB on an exchange basis but its more expensive plus Randy can go bigger

However, before you do this, I would strongly suggest that you do Schrick cams first then after thats done an M50 manifold with 24lbs injectors, the MAF/TB and software. If you do it in that order you'll have the biggest gain per $ spent.

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