Quieting down true duals with tailpipes

I'm wanting to clean up the sound, mainly at high rpm's as it gets pretty raspy. What would be the quietest muffler out there that would fit behind the bumper where my spiral flows are?
Jason
Like the car has a pillow up it's ***
Perhaps you'll like them... http://www.youtube.com/watch?v=nxbqaJFBu2c

Any other ideas? I'm not so much looking to quiet the setup, just clean up the sound so it doesn't have that old farm truck with glasspacks tone at WOT. Should I go back to an X pipe (dr. gas) maybe?
Jason
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