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Technically none, but Dinan matches factory warranty time/miles period. If a BMW dealer performs Dinan tune, even if BMW denies warranty claim, dealership should back-up repair through Dinan warranty. Some external flashes capture original code and then can re-write, which may prevent prior tune detection
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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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