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Discussion Starter · #1 ·
Was prepping to replace my valve cover gaskets and happened to notice this hole in the intake. Is something supposed to plug in here? It looks like it came from the factory this way and the previous owner was an elderly woman so I doubt it's some diy cob-job...

It's upstream of the air filter so I'm not particularly worried about it, just curious is all.

Thanks!
 

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06 OBW 2.5, 05 Forester, had 03 H6 OBW
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It could be when you are going fast and let off the gas they needed to not build up pressure in the intake tract, maybe there was a small glitch when you put your foot back on the gas.

Or, maybe they found the first part of the intake was prone to clogging with snow and that lets enough air in so you can drive.
 

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'00 & '01 OBW 2.5, AT, '95 jeep yj with galvanized frame, detroit locker, Super 35 axle kit, 4.88 gears, 2.5 5spd, 1964 Austin Healey Sprite basket case that will someday be subie powered
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My '01 outback 2.5 a/t has this as well. Probably for warmer engine compartment air. I dunno. Been wondering about this myself!
 

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2002 Outback Wagon 2.5L Auto Weather Package
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I think it may be part of the noise reduction tuning on the stock setup. I recently did an intake mod and after it was in place I noticed a very strong puffing pulse coming from the hole at idle. There was no obvious strong pulse like that with the stock intake plumbing in place. The hole is nowhere near big enough to make up for a snow plugged intake horn, and it doesn't have any tubing for a positive feed of warm air.
 
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