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4" cat back is overkill and no it will not fit a 3" down pipe, although anything is possible with exhausts if you're willing to pay for custom fabrication. Nobody makes 4" cat backs for the Legacy platform.


You can find a lot of 3" exhausts. Avo, Invidia Q300, Magnaflow, etc. I run MeganRacing's OE-RS cat back with the quad tips which I recommend if you want a more refined rumble when you step on it but it is still quietly tame at idle. They are hard to find though.

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