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2002 Subaru Outback Limited - 2.5 L Boxer H4 - 5 Speed Manual
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341 Posts
Discussion Starter · #1 ·
Hi guys. I've been looking at my making my air intake a bit louder (the idea of the honk sounds cool to me!) but I don't want to go as far as changing the travel of the air, location, etc. All I want to do is remove the air box that seems to muffle the resonance. I like this picture, for example:



How would I go about doing that? Or, rather, could I simply remove that box, and somehow cover up the hole where the intake pathway would connect to this box? Could I even just leave the hole open?

In the end, I am looking at making my intake a little louder. If it increases airflow, then that is great! However, I do not want to decrease it in any way.
 

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2018 and 2006 Outback Wagons
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I'm no engineer, but I suspect removing the resonance box could decrease airflow into the engine by making the flow less smooth.

Since I think these engines rely on a pressure sensor in the manifold to help determine fuel delivery it seems that a "choppier" airflow would have a negative effect on gas mileage.
 

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2002 Subaru Outback Limited - 2.5 L Boxer H4 - 5 Speed Manual
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341 Posts
Discussion Starter · #3 ·
I'm no engineer, but I suspect removing the resonance box could decrease airflow into the engine by making the flow less smooth.

Since I think these engines rely on a pressure sensor in the manifold to help determine fuel delivery it seems that a "choppier" airflow would have a negative effect on gas mileage.
I definitely see what you're saying, but on the countless intake mod threads on here, anytime that idea was brought up it was met with an explanation as to why this mod only helps. Apparently the resonators cause the air to move less smoothly, and companies like Subaru add them, knowing that they decrease performance, but do it in the name of a quieter engine.

I only posted this to find out how to remove them and how to cover the holes where they used to be attached to.
 

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I will tell you that a number of Civic owners have removed resonators in the name of creating the same aesthetic effect that you wrote about. On the Civics, what others have done is to remove what is effectively a snorkel. The air now enters toward the bottom front of the air compartment with less restriction and as cooler air. Think of it as a poor man's CAI. A lot of these people have also combined this mod with the addition of a K&N filter. Some have had to reset their ECUs, others have not. Give it a try. Just keep the parts so you can reinstall them if need be.
 

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2002 Subaru Outback Limited - 2.5 L Boxer H4 - 5 Speed Manual
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341 Posts
Discussion Starter · #5 ·
Thanks Bob-blehead. I just got done taking off the main big resonator - I covered the hole where the intake path would enter the resonator with metallic tape; a couple layers. It is pretty secure. However, as I took everything apart, I found that there are two more, smaller resonators further ahead! And, with these two, they are "permanently" stuck to the intake path by what looks like two little screw pieces. Anybody know if there is a way to remove these without destroying anything, and if the metallic tape seal is an okay solution?
 

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2002 Subaru Outback Limited - 2.5 L Boxer H4 - 5 Speed Manual
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341 Posts
Discussion Starter · #7 ·
I checked it - unfortunately that is a different hole
 
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