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well seems it happened after taking the cats off, if i were you i d search for the logs of the car assuming the sensor on catless downpipe is working properly.. yes some faults not appear on dash but the car records them.. if nothing seems.. then start from the places where can hurt while changing the downpipe.. maybe some of the things over there is causing those idle differences.. if your rear wiper wont work sometimes it affects somewhere totally different on BMW's.. needs step by step inspection..
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