Hey all, I just bought a Titan LE and love it

I have been reading this forum and think its great that everyone helps each other. (united we stand) anyway i think i will do the airbox mod and a k&n drop in. My problem is with the exhaust. I see allot of different setups. I think i will go with true dual but i need to know which muffler is the softer sounding (vortec turbos or flowmaster 70s) also, which cross over is better(H or X pipe)