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Is anyone familiar with the 2013 X5d exhaust? I went into a reputable shop and they told me they couldn't remove my secondary cats as the new design is for O2 sensors to be after these as well. Usually, the O2 sensors are ONLY before and after the PRIMARY cats.
Any truth to this? I removed the resonator and muffler and have absolutely no change in sound or tone to the exhaust...even on WOT.
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