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      10-11-2021, 11:04 AM   #5
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Drives: M550i
Join Date: Apr 2021
Location: UK

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400 cell options are on the market for the M5. They use the GESI cores for guaranteed no CEL. They cost quite a lot and are a big job to fit. For someone who doesn’t want to maximise the benefit of aftermarket cats by not tuning and in turn not impacting warranty status, the question why bother comes to mind…
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