Actually, it can definately be done. Since you have the 1SB, the wiring for the receiver itself is already in place, but you may have to do some wiring at the back of the head unit (you can just use your existing head unit, they are the same). You will then need to run a line for the antenna. You will need to get the digital receiver which sits behind the drivers side seat near the rear speaker on that side. Check with someone like KarShop for the components. If you are not able to do it yourself, the cost is likely going to be substantially more than if you were to buy an aftermarket set up. You will use your existing head unit.