Did you properly torque the factory ball clamps?
http://www.fordracingparts.com/download/instructionsheets/FordInstShtM-5230-MGTCA30.pdf
It is possible that you may need to loosen and adjust the piping to eliminate a leak at the ball clamps.
I don't know of any other materials to seal the leak other than maybe some muffler repair tape.
http://www.fordracingparts.com/download/instructionsheets/FordInstShtM-5230-MGTCA30.pdf
It is possible that you may need to loosen and adjust the piping to eliminate a leak at the ball clamps.
I don't know of any other materials to seal the leak other than maybe some muffler repair tape.