Some time ago, I removed my stock exhaust and replaced it with the largest Magnaflow straight through muffler and moved up to 2.5 tubing from the cat back. I wanted more of that V8 sound. I removed the stock rear resonator to tuck the tail pipe up for better ground clearance. Eventually that system got too loud for me. I then added a glass pack resonator in front of the Magnaflow and still a lot of drone. Eventually, I replaced that system with a Dynomax Hemi muffler which is not straight through, and a Magnaflow resonator in front of the muffler. This system was quieter but I still got a drone between 1600 and 2500 RPM which is annoying between 50 and 65 MPH and where I often drive. So, I added a butterfly valve from a Chevy truck's exhaust (from the muffler shop's scrap yard) before the resonator and now have kinda the best of both worlds. It's really quiet until you get on the gas and then a good V8 sound. The biggest draw back to this butterfly valve is that you need to kick the gas a bit more than normal to get the truck to kick down a gear because the butter fly needs the increase gases to open wider.
Honestly, if I had to do it again I might only remove the stock rear resonator and call it. I have been modifying exhaust my cars and motor cycles for over 40 years and have fairly good butt dyno... neither of these after market mufflers added any noticeable punch or grunt just more V8 sound. The only other vehicle I experienced no gains with a modified exhaust was a BMW M-3 because the stock exhaust was so well designed. My conclusion is that the biggest drag on exhaust gasses is in front of the system and gets crimped down at the cross over pipes. True dual's are not possible because you can't get a second pipe over the axle so drone with a single high performance muffler is probably something one needs to enjoy, or at least tolerate, with a modified exhaust. Some people might like it. I know as a teen a blown out Cherry Bomb on my Olds 442 was a thing of beauty. Yet, now as an older guy, I am like you and would prefer quite more often than loud all the time.
So, given that you want quiet you might want to go with a stock exhaust. I think Walker makes a replacement OEM muffler in 2.25" for under $300.00. Also, the GX460 is by far quieter than the GX470 so you may want to look into that system. Go take a test drive and see if the 460 exhaust is more to your liking. A good muffler shop should be able to help you out with customizing the fit. Of course quiet and too loud is relative to the individual's ear.
