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I also have an 03 Sequoia and I replaced my factory JBL head unit. I had to buy a dash kit to fit the factory opening and I used a single din Alpine unit. I recommend that you let someone that knows electronics to help you. It is a little more difficult than the standard install. I had to piggy back off the factory door speaker amps and use an ohm resistor to eliminate the ground/loop noise. All in all, it sounds great, but the factory system is a pain in the butt to mess with. The only inconveinence is that the door speakers start getting really loud and as you barely turn up the volume. So if you plan on adding a subwoofer or stealthbox, use an amp with a lot of boost to compensate for the piggyback.

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