Not sure where you keep getting this $3,000 claim as the HK system is a $1,995 "upgrade" It sounds OK but definitely not spectacular.
Saying that I went with the HK system mostly so all the wiring would be in place and I can just change out the factory speakers as I see fit. I will eventually change out the entire system as far as speakers, subs and amps as I do in all my vehicles.
My 13 Ram regular cab is all JL Audio, 600/1 slash amp, 300/4 slash amp, 4 6x9 C2 speakers and 3.5' C2 dash speakers and custom box with 2 10" W3 subs and it's been in since 2015, I am very happy with this set up.
My Road Glide is 1200/4 Sound Digital amp and 4 6.5" DB Euphoria speakers, sounds good but I need to add some more

needs more punch

So I will do the same to the Challenger, eventually!