Duals have no performance gain, it's purely for sound and looks.
DPP and I have exchanged words about backpressure on the 6.0, his opinion is that no bp = lower egt's and a better running truck. My opinion is that you need SOME backpressure on the 6.0 for warranty and code reasons as well as a few others that I have no factual information about, only speculation. DPP claims he has recieved actual experimental data that was collected from a few aftermarket vendors stating that no back pressure is actually best for the 6.0 (like the 7.3). I can't wait to get my hands on it so I can use it to change my opinion and link people to the information.
At the same time, I'll print it out and hand it to my friend who will then return to the dealership to get a refund since the aftermarket exhaust he had on his truck apparently was the reason for Ford denying his repair.
Last edited by Marty; 10-03-2006 at 02:50 PM.