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Well i know a nice x pipe would be awesome for power, since at the same time i get the x pipe i am getting the Rogue engineering pulley and the ESS tune with it. Its either challenge, Akra or custom... maybe a few others in mind not sure.
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Current: 2013 E92 M3 AW DCT
Past: 2011 E90 M3 AW DCT, 2011 E92 M3 MR 6MT, 2008 E92 M3 AW 6MT
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