You will think Im crazy but a flow 40 with a 3 in pipe over axle actually sounds decent. Thats about the deepest sound you can get.
I don't want loud, I just want a deeper sound from the exhaust. I was thinking a Flowmaster 40 series, too. I just don't want something that'll sound stupid all the time and get annoying when driving.
Get a 3 chamber 50 or 60 series, even a 70 series. 70's are long, but still not as big as the factory muffler.