Decided to replaced the factory Business CD unit. CD's started skipping and wanted blue tooth. Installed a Kenwood receiver and wiring harness from Crutchfield. Followed the directions, easy install no issues. Sound is much clearer and better, and head unit has a lot of new features. It was very straight forward install. I took my time, maybe two hours total. I wish I did it sooner.
Now to update speakers next..... (I know I still have factory amp...)