Look at the system you have currently, if you have the stock amp and it's working well, I don't know that there would be a reason to remove it. My car also came with a poorly installed aftermarket system and minus the factory amp, so that wasn't an option.
If you're new to stereo installs, though, I'd ask the people at Crutchfield for help. They have adapters for pretty much everything, and offer a service where they prefab the wiring for you. Like, if you pick an aftermarket head unit, they'll take the wiring harness from that and connect it to the adapter for your car, wire by wire. All you need to do is plug it in.
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