[Diy_efi] Can constant WOT operation destroy a muffler?

[Jim Bannister]

Have you checked your motor mounts?  At WOT your engine might be moving
enough in the mounts to physically mangle your muffler.  I've experienced
situations where engine movement has damaged the exhaust system.  The latest
case was in my FWD Ford van.  I came off a snowy patch with all four tires
spinning pretty good.  When the tires hit dry pavement the sudden jolt to
the power train twisted off the weld between the cat and muffler.
Jim B.

For rubber mounts, you can use a slice of tyre, seen this very often for
aftermarket mods to exhaust systems, had something similar when I had
a 3" exhaust put through...