This is something I looked into and from the information I found out, its not as easy to do as I first thought. Changing the components is easy but the parts information suggests that different systems have different wiring harnesses.
The base system has the amp built in so the speaker wiring will run from the dash. The high performance system has a separate amp mounted in the rear quarter panel, hence all the speaker wiring runs from there. There's also an optical link between the HU in the dash and the amp.
I'm sure it can be done, and if you go for it, I'd be interested to hear how you get on and which wiring is pre-fitted or needs to be added.
I was also planning to change the speakers and add tweeters to the rear doors as the standard system doesn't have them.
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