Whip me with a wet noodle if I couldn't work the search engine right (the key is not on the left with the damn thing!!) but has anyone done the BC Velocity exhaust mod??
http://www.bcvelocityexhaust.com/
I don't see where it could do that much, but it's also not much work to do it. The price is fairly high, but if it just gives us a cleaner and more aggressive sound it will be worth the money and the half hour it should take.
The one note I make from their pictures is they are replacing the hard T where the two exhaust streams just clobber straight into each other, but the same thing looks to happen again when it goes into the double tailpipe. From their pictures it looks like the exhaust must again make some really abrupt direction changes and be squeezed thru the connector to the two little short tailpipes.