I just got an 05 ls v8 last night and I love it so far. I have a few questions regarding the options that were avaible for the car that mine does not have. It has a 6cd changer, does this mean it is the thx stereo or the auduipile. How can I tell if it is the thx system? If it is not can I get one and put it in, from a dealer, would it be worth the money? Also the car does not have navigation but is something I would like, can I buy the actual navi unit from lincoln and swap it right in with a new double din bezel. Is this an easy task and also worth the money? Las thing is that it does not have h.i.d. lights. I know this was and option from lincold, did the hid lights have a projector in them? also can I buy these and swap these in? Or would it be better to just buy an hid conversion kit off of the internet? Do you guys recommend any good sites to buy parts and accesries (sp?) from like for performance and interior things made for the car. Thanks very much for taking time to read and respond.