[392cobra]

Tim,
You need some isolation on the sidepipe mounting.It is a matter of when not if you will break the bracket off your pipes mounted metal to metal.
A lot of guys have broke theirs off even with a rubber insulator.

Most have cured the problem with engine torque straps.
Rob at Keith Craft Motorsports in Plano made me one with heim joints.The engine doesn't torque over putting stress on the pipes or motor mounts.