spiff72 — I was curious about this myself. I can't say exactly what the differences are, but the car's wiring harness has a 4-wire cable connecting to a 4-pin socket on the original AUX socket assembly: Left, Right, Ground, and a fourth wire that tells the radio when an AUX device has been plugged in. The new AUX socket assembly has an 8-pin socket with a (new) 6-wire cable running between it and the input to the noise filter module. The output from the filter module uses the car's existing 4-pin plug to connect to the radio. I assume that they have separated some of the common grounds to prevent the ground loop problems that caused the original noise. Are they using isolating transformers? Without pulling these items apart to investigate, I can't say exactly what the changes are.

Stan