OKAY! So, I have always been taught true duals are the way to go. I had a 2001 5.9 liter and I went dual 3 inch and lost torque for sure. I figured i went too big, and that motor wasn't very fast. So this motor is stronger, so I figure if I go dual 2 1/2 with x pipe ill be fine. Here lately though, I've read if I go single it will be more beneficial with power and torque. Any opinions on this? If u think single then how big? Thanks!