Maybe the PO was using an Ansa style rear muffler, which we found had an irritating drone right at cruising rpms, regardless of which gear it was in. We tried using marine industry sound absorbing sheet w/adhesive on it, stuck under the rear seats and under the carpet panel in the trunk, including spare well. Made little difference. We had to sell that Ansa to someone else and go back to stock. Much better.
Alfas of most models are pretty darn sensitive to which mufflers they have. It has been my experience through the years that aftermarket mufflers do not work as well for pleasant sounds as the stock ones do.
89 Milano (wife's daily driver since 1989, Shankle Sport)
91 164S (my daily driver since 1994)
94 164LS (~Q) (trip Alfa since 2000)
72 Morgan 27 (water time since 1976)
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
Last edited by Del; 04-20-2017 at 03:23 PM.