Fwiw, I would just change the mufflers. I like pypes race pro. They are straight through but one of the quieter mufflers out there. (more so than magnaflow or dynomax ultra flo) I have zero drone with h-pipe and dual 3".

Friend of mine has a roadrunner with dual 2.5" and x-pipe with the same mufflers and sounds great as well.

69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700