Just had a Flowmaster Series 50 Delta Flow installed yesterday. Just a direct replacement of the stock muffler and removed flapper. Sounds exactly like I was shooting for, still muted and not at all obnoxious, but can now actually tell it is a V8! I didn't want much noise inside at all and it is great, you can hear it but it's not intrusive. No drone at all, except of course when V4 activates and then it sounds terrible but that is going away as soon as my Range AFM disabler gets here. I was a little worried that the 50 Series Delta Flow would be so quiet that you could hardly tell the difference from stock, but that's not the case at all.