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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > Performance Air Filter for F30 328i N20
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      03-14-2012, 08:25 PM   #1
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Performance Air Filter for F30 328i N20

AFE OE Replacement air filter for the BMW 328i F30 2012 L4-2.0L (t) N20. This filter is available in Pro 5R (P/N: 30-10225) and Pro DRY S (P/N: 31-10225). Constructed with 100% polyurethane, this high flow, OE replacement performance filter outflows the stock paper filter by 28% resulting in improved horsepower and torque.
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Last edited by HP Autosport; 03-14-2012 at 09:45 PM..
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      03-14-2012, 11:45 PM   #2
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Any dyno traces available?
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      03-15-2012, 12:16 AM   #3
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Quote:
Originally Posted by clarence View Post
Any dyno traces available?
No, not yet.

Just looking at the flow numbers you will pick up some power.

There will be a HPA version of the N20 high flow air fitler very soon as well!
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      04-07-2012, 12:14 AM   #4
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What's the difference between the "Pro 5R" and "Pro Dry S?"
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      04-07-2012, 12:50 AM   #5
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Quote:
Originally Posted by sleedawg View Post
What's the difference between the "Pro 5R" and "Pro Dry S?"
Pro 5R is an oiled filter and supposed to flow better. Pro Dry S is a dry filter.
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      04-16-2012, 10:28 PM   #6
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Forgive me, I've never used an oiled filter. Does it come oiled? Do I need to re-oil it? Clean it? What's the process for cleaning? or do I just replace it? How often? Again, never used an oiled filter so I'm really curious...
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      04-16-2012, 11:00 PM   #7
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Quote:
Originally Posted by SD_F30 View Post
Forgive me, I've never used an oiled filter. Does it come oiled? Do I need to re-oil it? Clean it? What's the process for cleaning? or do I just replace it? How often? Again, never used an oiled filter so I'm really curious...
The oiled filter comes pre-oiled, just install it and go. When it is due for cleaning, you will need to clean it, allow it to dry, then apply oil before re-installation.


There is also a dry version that doesn't require any oil.
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      06-07-2012, 04:56 PM   #8
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Really!!! I have some prime real estate for sale in Florida!
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      06-07-2012, 05:10 PM   #9
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how much HP gain?
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      06-07-2012, 06:05 PM   #10
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A few HP over a grubby stock filter.

Many oiled filters actually decrease performance from stock after they have been installed in the car for a while and have gathered some dirt. You are typically better off leaving it stock unless you are going to fastidiously clean and re-oil the filter on a very regular basis.
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      06-07-2012, 08:09 PM   #11
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Also available for F30 335i ?
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      06-21-2012, 05:24 PM   #12
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Quote:
Originally Posted by darmawaa View Post
Also available for F30 335i ?

Yes, it is!

Pro-5R version is ready.


http://www.hpashop.com/aFe-F30-335i-...nel-Filter.htm
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      06-21-2012, 07:28 PM   #13
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Quote:
Originally Posted by HP Autowerks View Post
AFE OE Replacement air filter for the BMW 328i F30 2012 L4-2.0L (t) N20. This filter is available in Pro 5R (P/N: 30-10225) and Pro DRY S (P/N: 31-10225). Constructed with 100% polyurethane, this high flow, OE replacement performance filter outflows the stock paper filter by 28% resulting in improved horsepower and torque.
I see this "flow" figure thrown out a lot by filter manufacturers.

Does this mean a 28% increase in flowrate at the same pressure drop? What kind of pressure drop across the filter do you get at different air rates?
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      06-21-2012, 07:40 PM   #14
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Quote:
Originally Posted by ProbyOne View Post
I see this "flow" figure thrown out a lot by filter manufacturers.

Does this mean a 28% increase in flowrate at the same pressure drop? What kind of pressure drop across the filter do you get at different air rates?
That is a question for AFE. I don't know how they come up with their numbers.

We measure filters on flow benches and the results are a percentage, see this thread:

http://www.e90post.com/forums/showth...ght=flow+bench
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      06-21-2012, 10:38 PM   #15
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Quote:
Originally Posted by HP Autowerks View Post
That is a question for AFE. I don't know how they come up with their numbers.

We measure filters on flow benches and the results are a percentage, see this thread:

http://www.e90post.com/forums/showth...ght=flow+bench
Based on that thread the filter pressure drop was held constant and you measured the corresponding flowrates (given as a percentage).

That is exactly what I wanted to know... Thanks
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