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2005 Forester 2.5X RWD JDM 6mt
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454 Posts
That is your crankcase vent. One for each head to vent back into the intake system to recirculate the vapors.
Aftermarket intake systems are crap, that's why. You can also tee them together and run the 1 to the aftermarket system.
 

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2016 and 2020 Foresters
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1,162 Posts
Aftermarket intake systems are crap
For the N/A Subarus this is absolutely correct. The manufacturer knows that there will be no performance gains, so they slap together whatever crap the can sell.

Turbo Subarus are another story completely, but consensus seems to be that the stock intake on a Turbo Subaru flows well enough that an aftermarket intake isn't necessary until you start making big power.

If you can return it and get your money back, you would be best served by doing so.
 
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