If you really want something that's not really loud, go with the carbon fiber mufflers and the 18" resonator. The cf cans give it a slightly higher pitched, "exotic car" sound. The SS cans give it a deeper sound.
I have a non res'd CF cat back, and when it was just the car back part you could barely hear it in the cabin when cruising at 55-60. Now that I have the headers installed as well, my neighbors hear me in the morning when I start the car to go to work. It's LOUD. Just the cat back didn't have a drone, but with the headers it did do I put some GTmat in the trunk and that helped a lot. You can watch my videos for the cat back to see what I mean
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