Re: '14 or '15 SRT - thoughts on upgraded audio?
I think the HK system sounds pretty good for an OEM system. I haven't heard the base system but have heard from others that it is pretty lacking.
As for aftermarket, you would need something to sum the channels to get a full range signal since swapping headunits is a no-go, but can be done.
2015 Billet Silver
2012 300SRT, 2009 Jeep SRT, 2006 Charger SRT
Too many mods to list for each, so let's just say a lot was done over the years.