6 6.slow New member Joined Sep 24, 2015 Messages 1 Reaction score 0 Points 0 Location Odessa tx Sep 24, 2015 #1 I have a 2004 2500hd with the 6.0l engine. I have true dual flowmasters and was thinking about gutting my cats. How much of a sound difference will it be. I want it louder but not abnoxiously loud. And also will it help in performance?
I have a 2004 2500hd with the 6.0l engine. I have true dual flowmasters and was thinking about gutting my cats. How much of a sound difference will it be. I want it louder but not abnoxiously loud. And also will it help in performance?
98trck Member Joined Feb 23, 2011 Messages 323 Reaction score 0 Points 16 Location Chandler Az Sep 27, 2015 #2 it would freak out the ecm and cause it to go into limp mode and you would loose performance
