Exhaust System To Tame The 440

[OldChargerGuy]

Hey, Imperialists:

My recent '68 Imperial Crown purchase came with a single exhaust, proper for a K-series 440 engine, but the previous owner had a glass-pack muffler on it, and I use the term 'muffler' loosely. It was loud!
Though it has the K-series, the previous owner found a proper L-series dual-snorkel air cleaner and installed it; it looks cool. Naturally, the first thing I did to the car was install dual exhaust, telling the exhaust dude to make the car as silent as possible. We even added an x-pipe for noise cancellation. Failure. It was better, but still too loud.

A Mopar associate mentioned to me that Imperials were built with 30-inch long mufflers. I took it to his shop, but he installed inferior mufflers and added resonators. I couldn't tell any difference.
While giving my hard-of-hearing mother a ride in the grand luxury car, she said, 'isn't it a bit loud?'. What a bummer.

So, what now? Where may I get these big, Imperial mufflers?
An H-pipe on my '66 Charger reduced its exhaust noise noticeably, but that X-pipe chamber seemed to be a source of noise; it was removed. Any experience with H-pipe verses X-pipe configurations?
Was it a mistake to go with dual exhausts? My mother's '68 Imperial was a single-exhaust car, and it was silent.

Thank you for your insights and experience, gentlemen . . . and ladies.

[ImperialAtom]

Can you put another set of full size mufflers on the back instead of those resonators?

[OldChargerGuy]

No, the resonators barely fit. When I find the right mufflers, the resonators will probably be removed.
The first mufflers and x-pipe are for sale now. I reckon the second mufflers and the resonators will be up for sale someday, too. What an expensive mess.

[DonFromTexas]

I had a steep learning curve on my first 59. Finally found Waldrons will do you right and do the pipes right as well. Just let them guide you to what you want.
I found for the 413 the dual pipes thru the mufflers they furnished was just the right tone without the resonators. I have a spare set of resonators in case they would help you any,

[OldChargerGuy]

Thank you, DonFromTexas. Waldrons had everything I needed; they knew what I was looking for when I said "Imperial". Time was pressing me to finish the exhaust before my family's reunion, so I had a professional install it. Poor workmanship, but it's quiet like she should be. I'm taking the car back to have the pipe knocks adjusted out. Does anybody check their work anymore?

[DonFromTexas]

they have made complete systems for each of my 1959 models, and they were simply perfect fitting since they actually use the factory computer bending settings.