yes, between where the two pipes merge and the converter. its sits on top, rising vertically. You need special socket to remove. It'll be in there real tight, believe me. best to apply lots of liquid wrench or equivalent, let it sit for some time.

Many have had to either rap on pipe to vibrate the rust off the threads or apply heat with a small torch to loosen.

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1995 MB E320 Wagon
2001 BMW 530i
2007 MINI Cooper S (!)