These are dual in dual out for a 6.0L or 8.1L i had them on the 8100

Gibson has kid hammer damage, about 500 miles on it. $100

small flow master knock off. My wife and kids had this put on for me, The exhaust guy was retarded its 2" in and 2" out, sounded good but wouldnt run in the upper rpms on a 8.1L $50.

Big flow master want to be, I dont remember the name of this, ill look tonight, Its currently on the truck, sounds good, runs grate dual 3" in and out with a X pip in the middle that is 3" as well... it doesent neck down like the one mention above. $75.00