Patrick

When you devise a support for the tail pipes be sure it has some flex in it
to allow the pipes to move with the engine plus thermal
expansion/contraction. A support is a good thing but a rigid attach point
will insure more cracks.

I've hung mine with a couple of moderately stiff springs just below the
firewall edge and have over 750 hours on that arrangement with no exhaust
cracks.

On my early LNC2, the pipes on the left side of the engine were designed to
be rigidly attached to the side of the engine (at a sump bolt) and it failed
within the first 50 hours (perhaps even before, but that's when I found the
crack). After repair, I replaced the rigid attach with an exhaust attach
taken from a Cessna (182 I think) and that has also worked fine.

Dan Schaefer