Zero drone. I went 2.5 in piping and removed the secondary cats. It's a flowmaster super 40 dual inlet single outlet dumped behind the axle. I live in the mountains in Colorado and there's no annoying drone on the way to go snowboard. It's only loud when you would want it to be. Best I've seen so far no disrespect to anyone else but The guys that figured out this setup for me did the exhaust on the jeep that won the king of hammers competition last year. I had 70 years of experience design this system. And it only cost me 417 installed including muffler and piping.