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I have one as well, along with a K&N filter. I did notice a sound change. Sounds a little deeper and louder. It's not significant but I did notice it even from the inside.
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I wonder why Subaru hasn't adopted their design, a 2 mpg improvement would be a big deal for their CAFE averages.
 

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ModFather
2019 Subaru Impreza Sport 5 Dr. Manual Shift
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The OEM intake has a Helmholtz Resonator in order to quiet down the intake noise. The general public is not interested in hearing the induction noise, some us don't mind so much.

 
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Has anyone done a comparison between SSD vs. AEM vs. K&N Cold air intake? Would like to know what differences there might be...
 
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