I have two 14 (i think ) inch magnaflows dumped just past where the bed starts, before the axle with no cats and I get no drone. It is a bit to loud for my style but I can fix that with a pair of bullets. I dont like to advertise any more than I have to. The sound is GREAT and no drone I just want to quiet it down just a little

 

You can see where my tailpipe comes out right here with my larger muffler. No drone so far.

 

2 super 40s right before the axle and is not loud at in cab