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You need to lawyer up, but also find out who did the tune, contact the company and get them to back their product. Where did you buy car? Can you see the add on wires/box in the engine bay for the piggyback?
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Previous BMW: 16 M4, 13 M6; 14 M235i, 12 BMW M3; 11 BMW M3; 08 BMW M3; 08 BMW Z4M; 04 X3; 02 M3 Convertible; 02 M3; 00 M Roadster; 94 325 convertible; 92 325i Convertible; and 85 635csi
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