At this point I have pretty much eliminated Flowmaster. I now understand the relationship between the chambered design and the resultant hollow tone characteristic of the Flowmaster , and it's not what I want. I think that interior drone comes from that metallic sound and associated frequencies.
As I said earlier , I am pretty new to all this... but learning.
Keyed by White Dog I researched Dynomax Super Turbo. That muffler seems to have the rumble I seek ; not excessively loud. Sounded real nice on a Firebird with a 350.
A knowledgeable friend steered me in the direction of Magnaflow , 4x9 oval or 4" round.
It seems that there are lots of good amatuer sound clip videos for Dynomax , but a search for similar sound clips for Magnaflow turns up one corporate promo after another , and they are overproduced and annoying.
