Ran out the back like in the picture I believe it is in the second post would be clean! Even if it's single 3". I've ran it in front of the tire on multiple setups and the only would that didn't sound flappy was my 3.5" 5x11x22" magnaflow setup I had on my crew cab. Others had any annoying flow master sounding flap in it. I'll post videos with details on the entire exhaust.