Has anyone ever tried the Moroso spiral flow mufflers? A couple of my buddy's have them on their LS1's and they sound pretty d@mn good! They are pretty cheap too, around $50 ea. from www.Jegs.com. Considering how Mustangs usually sound better than their GM counterparts, I think they would sound good on a 4.6l. I tried searching on youtube for some soundclips, but only came up with TA's and Camaro's.
A buddy of mine has flowpro twisters on his LS1, which is the same design concept. They sound SWEET on the LS1, but somehow I dont think they would sound as good on a 4.6.. I almost decided to get a set and have them welded into my old SLP catback, but I decided to get the MAC instead. If you do get those mufflers, throw up a sound clip