I have a problem when the engine gave off a loud noise when running.
The sound seems to come from the engine, not under the car or muffler.
The mechanic diagnosed it as a cracked flex pipe that runs to the
exhaust. Apparently, in some cars, the engine literally lifts on its
mounts when the gas pedal is pressed. This strains the connection to
the flex pipe, which sometimes cracks/breaks. Now the exhaust escaping
from here, gives off the loud noise.

Cost to replace the flex pipe piece $175.
He also suggests that I replace the engine mounts to prevent it from
lifting when given gas. Cost for this $275.

I will get the pipe replaced, but should I also replace the mounts? If
I don't any idea how long the flex pipe will survive before it breaks
again? Any info will help.
Thanks

Mark Sabatini