Might want to check out ###. I took off my Flowmaster 40's on one of my trucks. Had a true dual system on my 03' V8 Mountaineer. Headers, two 40 series mufflers, custom x-pipe etc. Didn't care for the sound of the 40's. Bought two ### mufflers, and wow, even had a guy back at college get rid of his expensive Corsa exhaust on his Escalade for a ### setup after he heard my truck. Just a deep, very throaty sound, no resonnance etc.
I never did care for the 40's, but had them laying around. I think they sound better on a setup like say a mucsle car with a built engine and nice loping cam. Wasn't really that they sounded bad, just the fact that it seems damn near every pickup/suv has them, and for whatever reason they seem to have a rasp on the Ford 4.6 V8.
But good luck. Even have ### on our Lexus LX470 lol. Sold the 03' but still have my 00', gotta order a dual in/out muffler from them, getting bored of not hearing the sweet sounds of a V8
