Intake or Drop in AEM filter - Page 2 - Subaru WRX Forum
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#16 Old 06-07-2013, 12:52 PM
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^That is a good point.

I have used short ram style intakes before without re-tuning. They can allow additional airflow, however as long as the MAF sensor is located in a correctly calibrated housing the ECU can still accurately "read" how much air is entering the engine and compensate for it up to a certain point.

Obviously a correct re-tune is best for performance with any type of mod, but many people use short ram style intakes without re-tuning.
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#17 Old 06-07-2013, 01:00 PM
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I've run a K&N drop in on my my '05 WRX and my wife's '05 Legacy since the OEM filters needed replacing, so maybe 6-7 years on each. No change in performance good or bad. I also run a K&N on the top of my old Malibu's 283. That makes the car run a bit more freely.

Not making a statement about what others should do. I was warned away from the K&N CAI on this forum for use without a tune and heeded the warning.

My 2 cents...

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#18 Old 06-07-2013, 02:21 PM
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K&N CAI is fine without a tune.
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#19 Old 06-07-2013, 02:22 PM
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Anybody notice how many different opinions there are in this thread...lol!


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#20 Old 06-07-2013, 03:11 PM
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Well, the K&N is among a select few that we've known for a few years is ok.
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#21 Old 06-07-2013, 03:39 PM
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I wouldn't get anything until you're upgraded enough to need it. You aren't going to notice a difference performance wise other than the looks.

The only reason I went with a short ram intake was because my FMIC piping did not allow for the factory intake box.

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#22 Old 06-08-2013, 07:29 AM
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Hmmmmm.....so back to a drop in filter.....Will the Perrin drop in filter be ok in my stock airbox with no tune?

Im not gonna tune my car just yet or put on a intake....
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#23 Old 06-08-2013, 07:30 AM
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Literally FOL!!

A drop in isn't gonna work for you though Bullet. Yours is good till like 300whp anyways.


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#24 Old 06-08-2013, 10:10 AM
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Quote:
Originally Posted by bullet85 View Post
Hmmmmm.....so back to a drop in filter.....Will the Perrin drop in filter be ok in my stock airbox with no tune?

Im not gonna tune my car just yet or put on a intake....
Foam filters are the worst possibly thing you could put on your car.

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Literally FOL!!

A drop in isn't gonna work for you though Bullet. Yours is good till like 300whp anyways.


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#25 Old 06-26-2013, 07:56 PM
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Just removed my K-N drop in filter after a month of trying it out in my 2013 WRX. I definitely recommend a tune if you are going to change out the factory filter. I am not ready for a tune due to warranty, so I put the factory air filter back in. I did notice the exhaust tips were filthy (probably running to lean) and the car didn't seem as spunky off the throttle at lower rpm's like it is with the factory filter. I did not change the type or brand of fuel I use and temperature has been steady 75-85 degrees throughout the past two months. I hope this helps.
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#26 Old 06-26-2013, 08:49 PM
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Quote:
Originally Posted by YASLIPN View Post
Just removed my K-N drop in filter after a month of trying it out in my 2013 WRX. I definitely recommend a tune if you are going to change out the factory filter. I am not ready for a tune due to warranty, so I put the factory air filter back in. I did notice the exhaust tips were filthy (probably running to lean) and the car didn't seem as spunky off the throttle at lower rpm's like it is with the factory filter. I did not change the type or brand of fuel I use and temperature has been steady 75-85 degrees throughout the past two months. I hope this helps.
Take off your panties and lose the stock tune! Stock tune is lethal! Cobb ap stage 1 flash you'll be a lot safer then the stock tune.


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#27 Old 06-27-2013, 02:24 AM
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Quote:
Originally Posted by YASLIPN View Post
Just removed my K-N drop in filter after a month of trying it out in my 2013 WRX. I definitely recommend a tune if you are going to change out the factory filter. I am not ready for a tune due to warranty, so I put the factory air filter back in. I did notice the exhaust tips were filthy (probably running to lean) and the car didn't seem as spunky off the throttle at lower rpm's like it is with the factory filter. I did not change the type or brand of fuel I use and temperature has been steady 75-85 degrees throughout the past two months. I hope this helps.
Well,

This is MY take and only that. But the exhaust being dirtier than normal is a rich condition, not a lean condition.... BUT it is dependent on WOT pulls and the way you drive. Without any data or logs.... that's a shot in the dark.

Also want to add that humidity plays a large part as well.

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#28 Old 06-27-2013, 05:29 AM
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Quote:
Originally Posted by pzr2874 View Post
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.
While I don't have logs, I can tell you that you def need to tune for a drop in filter for the 08+ WRX. I recently put a K&N drop in filter in mine with no tune and noticed that the power was lacking a little. But thats not the issue that concerned me, the idle was quite a bit lower there were a few times it tried to stall sitting at a stop light (Not taking off in first gear, just sitting there!) terrible gas mileage I normaly run around 21-20mpg, I could not get it above 17.0 mpg with the filter in and it caused a check engine light after a few days!!!
As an aftermarket intake should only be getting more air into the engine I assume that the problem would only be worse with an aftermarket.

Long story short get a tune if you mess with your intake.
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#29 Old 06-27-2013, 08:38 AM
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Wonder if Suby leaned the 08+'s out a bit to get a bit more power. Not certain... but good advice either way Leo

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#30 Old 06-27-2013, 04:18 PM
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I don't know a lot, but I try to help out where I can. haha
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