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Hello, Jakevandee what size subwoofers.

Also the Metra 72-5600 you will need for the rear decks 6X9 speakers. https://www.amazon.com/Metra-72-5600-Speaker-Harness-1998-UP/dp/B001OAB6BW/ref=asc_df_B001OAB6BW/?tag=hyprod-20&linkCode=df0&hvadid=312069187648&hvpos=1o1&hvnetw=g&hvrand=12461729238930487549&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1026528&hvtargid=pla-435899534081&psc=1

This is from a fusion but practically the same. On the window control panel just pry up and thee should be only one screw. The Metra 72-5602 are the connectors you need for all four doors. https://www.amazon.com/Metra-72-5602-Speaker-Connector-Vehicles/dp/B016YIFQ7I

Hello Woody and welcome to the forum. I say yes it is worth it, I went with Infinity Kappas in the front and reference in the back and I am enjoying them. I also have the base system.

Very nice.

Looks awesome. Great job.

Great find rubyinla This will help a lot of forum members in here.

Glad it could be of help to you.

Hello Checkerboard see if this video helps.

Welcome to the forum and enjoy your MKZ for lots of years.

If it says information is like drolds said it's not activated and like he said you can search the forum and also there are tutorials on youtube about this.

What does it say on the right upper side of the radio screen or can you take a pic of it.

Welcome to the forum and enjoy your MKZ.

Power Wire through firewall

This is where the cable comes out from the inside the passenger side right above the edge of the rug.