No "sound tube" on the V6, but was installed on the GT's. Perhaps my wording was not good. I should have said "sound muffler"
One popular mod is to install the sound tube on the V6's; this requires drilling and installing a 90 degree fitting (on the sound muffler part of the stock air tube; it's the square looking box molded onto the air tube), then buying the sound tube from a GT owner. Most GT owners remove them. Don't know exactly why; some say they are "cheezy", some remove them when they go the way of a CAI.
Another way to get the "sound" of excelleration is to simply cut off the muffler box of your stock air tube (tube that runs from the throttle body to the air filter box. This square box acts as a muffler to silence the air/combustion noise when the right pedal (formally known as a "gas" pedal) is pressed hard.
For about 3 months, I ran with the sound tube mod. I then got bored one weekend and cut off the "muffler box", fiberglassed the hole, and am currently running with that. Plenty of "sound" when you hit the gas pedal, plus lots of extra money in your wallet, as the stock air system already flows great amounts of air, and it's already a "cold air intake", as it draws cool air from the front of the grill. Same sound with this mod as installing an aftermarket CAI, but for lots less in shelling out money. I like that part!
So, two choices for sound.