I would start any exhaust replacement project with new clamps, etc. on hand, as I'd just assume any threaded fasteners are going to either break off or require cutting off. Cost of doing business.

But, any place where pipes slip into each other, I'd put exhaust paste (antiseize) there to at least make those come apart better next time.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles