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OP: FYI an air filter is not gonna make any significant power gains. AA's green filter is well built and that's what I'm using right now. Intake sound/noise may change but that's it. I believe AA's is better built than K&N, but that's just my appreciation. Want bigger gains? Go HFC/catless or better yet: S/C.
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2014 E63 AMG-S
2012 C63 AMG (P31) - gone
2011 E90 M3 FBO - gone
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