Intake or Drop in AEM filter - Subaru WRX Forum
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#1 Old 06-05-2013, 05:11 PM
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Intake or Drop in AEM filter

Which would be better for performance?
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#2 Old 06-05-2013, 05:13 PM
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Drop in aem or kn suck. I have the cai by aem. Really nice.


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#3 Old 06-05-2013, 07:39 PM
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Drop in aem or kn suck. I have the cai by aem. Really nice.


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Do you have a tune for ## intake? If not ## gonna run lean...MAF sensor wont read correctly...Im not gonna tune my car for quite awhile....so i dont wanna run and intake cause of the lean conditions.
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#4 Old 06-05-2013, 07:55 PM
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Long story short....

no custom tune = no CAI

Brandon - 13' SWP WRX Sedan
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#5 Old 06-05-2013, 09:37 PM
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You need a tune for a drop in filter as well


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#6 Old 06-05-2013, 09:39 PM
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You need a tune for a drop in filter as well


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Any filter that causes more air flow then the stock oem panel filter requires a tune!


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#7 Old 06-05-2013, 10:51 PM
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not to jack the thread but i have a perrin sri and perrin says i do not need a tune if i have a factory tune, do u guys think im good without a tune? aparrently the sri takes in a stock amount of airflow. ive read numerous threads about this but am still not sure. also would a dirty air filter cause hesitation or other stuttering?
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#8 Old 06-06-2013, 05:35 AM
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not to jack the thread but i have a perrin sri and perrin says i do not need a tune if i have a factory tune, do u guys think im good without a tune? aparrently the sri takes in a stock amount of airflow. ive read numerous threads about this but am still not sure. also would a dirty air filter cause hesitation or other stuttering?
A lot of the companies selling intakes claim you don't need a tune, but I'd think ANY intake upgrade is going to change air flow. That's the objective of the mod isn't it lol? So that's obv gonna lean out the car unless air's best buddy fuel is filled in on what's going on. I've read a few different threads too and it seems the older models can take drop ins and intakes better than newer models with no tune and CEL problems. Maybe someone more versed on all models can help with specifics.

I personally wouldn't inc either into the mix without getting the ECU to accommodate for it with fuel. Never stops some though...but we try to save who we can




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#9 Old 06-06-2013, 08:02 AM
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Drop in filters are fine from 02-07... Not certain for 08+

2002-2003 WRX's are more forgiving than the rest and may not require a tune.... Of course this has been beaten to death, but a custom tune will always be better than nothing or an OTS map.

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#10 Old 06-06-2013, 09:19 AM
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08+ is more critical to have a tune for any filter besides oem intake filter


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#11 Old 06-06-2013, 03:06 PM
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I can understand that.

The car already runs pig rich up top where the filter element has the largest impact.... I don't see it being THAT big of a difference.... Anyone have logs for an 08-13 WRX/STi with OEM filter and a drop in? Same day and or temp would REALLY be useful.

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#12 Old 06-06-2013, 03:28 PM
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You need a tune for a drop in filter as well


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No you don't.

And a drop in does absolutely zero at all for performance. Some paper filters actually outflow ones marketed for performance.
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#13 Old 06-06-2013, 09:02 PM
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No you don't.

And a drop in does absolutely zero at all for performance. Some paper filters actually outflow ones marketed for performance.
I digress Justin, the dryflows on the MS3 platform outflow K&N style and OEM style by 20-25%

Can't see it being much different

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#14 Old 06-07-2013, 09:10 AM
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I digress Justin, the dryflows on the MS3 platform outflow K&N style and OEM style by 20-25%

Can't see it being much different
Oh absolutely understood

Never, you're under the assumption that a less restrictive intake filter will mean more air in the cylinder, which is false. Your engine is an air pump and only takes in the amount of air that it needs. A less restrictive filter is just a matter of efficiency because the engine doesn't have to work quite as hard to get what it needs. Filter differences by themselves will not matter much at all when it comes to making more power on a stock car.

Air Filter Shootout Test - Results! - evolutionm.net

But keep in mind though that these results are going to very much more than it will on the OP's car because this EVO makes a considerable amount more power. Also keep in mine that consecutive dyno runs can vary 10 whp with no changes made in between runs (as evident by the no filter run making less power than some of the others WITH filters).
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#15 Old 06-07-2013, 10:52 AM
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More air into the engine means it'll run leaner. A small intake mod will do this, but it's generally not a big deal particularly against factory pig rich maps. The CAI argument wasn't related to the additional airflow, it had to do with repositioning the MAF sensor such that it's geometry lead to different airflow angles (or worse yet mounting a wider pipe at the MAF location) than what the tune was set to read.
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