Change out the license plate lights to LED. I have the 921 and it fits perfect over the T10. It helps the rear view mirror camera. I had them for almost a year no issues. I got them at Advanced Auto which comes with lifetime replacement.
I recommend changing the cabin air filter to K&N or one with charcoal filter.
If your battery is old I would change out for AGM.
Range AFM disabler
Change the head lights and fogs to LED.
Wireless CarPlay/Android auto. Magic box actually makes it and it comes with some cool stuff like Netflix and PlayStore apps so your passenger could watch movies.
Key fob carbon fiber case
Michelin Defender tires
Cross drilled rotors & pads that comes from GM for the Tahoes with police package.
Tint the front windows 15% to match the rears.
Center console organizer from Amazon.
Carpet Floor mats that are for the Escalade platinum. They don’t have any writing on them. They are way thicker.
Only use Dexos 1 certified oil. They have Dexos 1 gen 3 as of 9/22.
K&N cold air intake which makes the truck sound nicer.