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      09-04-2015, 07:15 AM   #3
M3an V8
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Drives: E90 M3 Alpine Weiss
Join Date: Oct 2013
Location: OC

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I suppose its not normal for the cat to slide right off without undoing the bolts, however, the flange on the header side it not really stationary(ie: welded on). When I installed my Remus h-pipe, I decided not to drop the exhaust, when I was halfway through cutting with the electric saw, the driver side vibrated off the header. Well I finished the install, shoved everything back, but I did ended up replacing the "donut" seals a month later.
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