I am going to pick up my MY04 MCS in about a week. I jux found myself getting interested in the Nav system. I think it's too late to make up my mind. Do you think Dealer will be able to install the stock Nav system after I got my car????

Ed

 

No.

Take a look at one of your brochures. Notice the entirely different gauge layout between the nav-equipped car and the non-nav car. No way could this be a dealer-installed item.

Your best bet, assuming that this isn't just some last minute passing fancy, is to try to swap your ordered car with a lot car once yours arrives at the dealer.