I got my Titan with the 6 disc changer and 8 speaker system would anyone suggest upgrading to the RF system, and would it be feasable, or would it be better to go and get something else?

Shadow

It all depends on user taste. Go to the dealership and test one with the Fosgate package. Then you'll know.

If you're going to spend the money to upgrade, go with aftermarket. More choice and selections plus I think you will get more for the money. From what I've heard the FS is not all that.