Maybe it's not needed, but you're not paying someone on here to tune your car, so if the tuner recommends it to be able to perform his job as competently as possible, then to me I'd just go with it. But that's just my 2c, which really isn't worth much. I don't even remember if I still own a Subaru seeing I haven't driven one for so long.
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Air is for pussies.
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