So here is the update -
I purchased the GT 350 Audio kit from Auto Fanatic (He has a number of posts on YouTube).
His system install video was pulled by Goggle due to music rights issues. You can ping him and he can fill you in on cost and other details.
The Kit comes with 2 subs, 2 rear deck mounts for the rear shelf, cables and various other items plus excellent instructions. I bought a JL Audio MX 500/1 AMP and a Stinger amp cable kit. Auto Fanatic recommends the JL Audio JX 250 /D. I went with the MX for several reasons including the small foot print. I spent 2 days doing the install. A lot of time was spent running around town getting stuff and also feeding the AMP power cable thru the firewall and into the battery box.
Once completed I test all audio features as well as all Sync 3 features. Eveything works perfect.
FYI - the rear deck shaker speakers are gone......
A couple of photos - power cable under battery tray JL Audio AMP.
A
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big win - the system sounds awesome.
So it works great, no system issues sounds awesome. 2 thumbs up.