I have the flowmaster direct fit on mine. I love the sound, i dont notice any drone at all.
The fit leaves something to be desired. Tubing seems to be a bit too large, doesnt fully seat into the factory connections. So I have a slight exhaust leak. Can only hear standing next to it. The factory clamps dont seal it well enough.
Looking into some aftermarket clamps with a step, hopefully that will fix it. Holley has been less then helpful on a solution.
Magnaflow I have always had good luck with.