I would check out DynoMax. I have dual Super Turbo mufflers from Dyno Max on my Chevy truck with a 5.7 V8. It has a real nice deep rumble. Something to do with an S design in the muffler gives it that nice sound. Maybe it might help make your V10 rumble a little. I don't know.
I know my cousin as the exact same engine has mine with dual flowmaster exhaust but it was't as nice or deep of a rumble as the Dyno Max Super Turbo.
Any Ford V-10 owners change exhaust???
