Suggestions for muscle car sound muffler without drone

So today I took a vacation day to work on the dart exhaust. I spent like 7-8 hours on this project. I finished fabricating and installing the branch resonators which are 1.5" diameter pipe tuned to 125hz. The tail pipes are 2" diameter. The drone is complete gone. In fact they even quieted the complete exhaust system down. I currently have the Dynomax VT installed and from the post above you can see I tried a number of other mufflers. Considering how extremely well these resonators work I could put the Magnaflows back in if I want. The resonators do absolutely nothing to the flow just the sound. They work GREAT. I installed one on each tail pipe at the point where the pipe come down after they go over the rear axel. I installed them with a saddle connection over a drilled hole in the pipe so the can be easily removed and to avoid having a stub on the tail pipes which would make their removal harder. The clamp connection at the 90 gave me 1" of length adjustment if I needed it. Even though I understand the science behind these I was amazed how well they worked.

After thinking about the results I believe I know why the resonators effected the drone and the overall sound. The mufflers create a low frequency tone to the exhaust system which would be more effected by something tuned to a low frequency. Some mufflers have more high frequencies in their design than the Dynomax mufflers.

Update:
After driving the car more I am enjoying no drone and quiter exhuast without restricing the flow. It may be too quite for some but I can listen to music/radio and I don't get tired of the exhaust. The exhaust before the change was fun for about 5 minutes of driving. Now it's actually fun to drive for longer peroids of time and you don't atract as much attention. FYI most of the black section of pipe isn't even hot.

For those who want more information on making branch resonators here's what I did. You have to first know the frequency of the drone. You can calculated it but I just measured it with an app for my Andriod phone called FrequenSee - Spectrum Analyzer. Then instead of using an equation to calculate the size of length of the pipe I used this site http://www.diracdelta.co.uk/science/...be/source.html . Using this site you can plug in dimensions and calculate the resonant frequency until you get what you want. The site also shows you a nice graph of the db verses frequency for the resonate frequencies. You have to have a flat capped end on the end of the resonator tube. It won't work if you crimp it down and weld it. A muffler shop tried that for a guy and it didnt' work.