Lease-V-Cross,

I used to be in the rental & leasing business so I have a little insight into this area. The CD player will need to work properly when you return your vehicle, or they will charge you to fix it (and you won't like their prices!). Technically, the stock CD changer and radio must be in the vehicle when you return it. I say technically because that is what your contract says; however, it all depends on the person doing the inspection at turn-in. They may not know or care if the unit is stock as long as it looks factory (ie, not a hack job) and operates properly. To be on the safe side, I'd buy a stock changer off eBay for cheap and then put in the one you want - change it out before you turn in the car, and you still have your nice unit for your next vehicle.