FWIW, I love the sound of the Dinan exhaust on my 2005 4.4!
It has a serious growl that turns heads (and sets off car alarms
) at idle and under hard acceleration, but it's barely noticable at a steady cruise (e.g. on the highway, or rolling around the neighborhood in a high gear)
Plus, it adds 7 HP and 6 lb-ft of torque
The CAI is not yet available for the new '04+ N62 motor, but when it is, you can bet I'll be all over it.
By the way, does removing resonators do anything for performance, or is it just for sound?