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intake question


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I have question about the intake that's on my 09 Subaru legacy gt. I currently have the aem cold air intake 21-475C(05-06). I just checked there website, and it seems I should have went with 21-866(08-09). Is there a big difference the two? The 21-475C has been installed on my car for a long time. If I decide to get the 21-866, do I need to do a retune or is it a like for like?


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