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ye iv been told just replacing back boxes wont do much, basically need cats and dpf out for any decent sound to be effective, both cars in vid have had this done. system iv ordered is the front y pipe, 2 centre pipes and two racing rear mufflers, for the dpf the company im speaking to are saying they just remove the core and reseal the original piping, stress test it and then retune the ecu to remove regen cycle, im just asking them as my car is currently remapped if that will be lost and what happens if bmw flash the ecu in services or so iv heard they do.
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