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How do you know the motor is running lean? The DME targets lambda and AFR will adjust as is needed to meet that. There is nothing AFR related happening post downpipes; your choice of mid pipes and axle back will have no effect on that. So swapping a new muffler in is not going to cause a lean condition.
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E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP
F30 N55 XDrive EBII
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