"Doesn't the wire transfer more exhaust noise into the cabin?"
No, doesn't appear to at all, although I use the stock exhaust system, not an aftermarket such as the Stebro which tend to be a little noisier to start off with.
Haven't had a problem with the rubber hangers in years. Don't remember when I had the last failure on any of the cars.
1989 Milano, Shankle Sport
1991 164S, stock
1994 164LS (~Q)
1972 Morgan 27
previously owned since 1964:
62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6