I did my last summer. Replaced seal with with audi part but left the old flange. Also replaced propshaft front CV joint as the boot had failed, grease gone out and it's bee running dry for a while and broke when I was pulling it off to replace boot. I only removed cats and left rest of exhaust and propshaft in place.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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