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2009 Forester XT 4EAT
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Without a tune it won't gain you anything but noise.
....and if you go to Cobb Performance and read the "notes" on the Access Port settings for the 09 / 10 XT, you will see that they tell you flatly to use the stock airbox AND stock filter to avoid running too lean air/fuel mix during high performance tuning. :crazy:
 
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