I have a 4.6 with a single magnaflow muffler dumped. I like the sound but wouldn't mind it louder. I was thinking about getting true duals with flowmaster 40 series dumped with an h-pipe. Does anyone have this setup? How does is sound and was there a power increase?

 

Xpipe and dual SI/SO Maggies are the way to go!

 

i dont have duals, but i also dream about them. lol

My truck got alot louder after i gutted my precats. If thats something you would consider doing to your truck then thats another option too.
-Patrick