These are the same queations that pop up about the fuel line
which doesn't have a rubber flex line from the frame to the engine.
These engines have quite ridged isolation mounts and move very
little. Metals that aren't taken to their yield point will
flex millions of times till they fatigue. The movement of
the L o n g exhaust pipe and L o n g fuel line to from the
pump back never reaches its yield point.
The proof is in the millions upon millions upon millions of
vehicles that were built that way for many many decades
without failure. Since it's your property now, you of
course have the right to redesign your truck any way
you see fit if you feel that your a better engineer
than the engineering staff that GM employed.

Denny Graham
Sandwich, IL

Denny G
Sandwich, IL