M6 to A4 question about noise.
Use a good silicone sealer when installing the sheet metal plate. Then dyna mat like you suggested then a sound deadening insulation. Way back in the day before there were alot of sound deadening products on the market I would use regular household insulation. I would cut it to size, take about 1/2 of it's mass off and tape it into place! it workes like a charm. Another thing you could use is the backing or nsulation under carpet.. it is called jute and is typically made from compacted cotton fibers.
Just make sure the noises are not abnormal! A torque converter is not normally noisy at all. I certainly do understand road noise at the floor tunnel after a swap though.
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