Decided to go with MBRP Cool Duals on the new Dmax. Leaving the Cat on and also getting a Preditor. How do they sound? Did you notice any difference in MPG and performance?

No Kitty- with muffler no @#$% from the Wife, I love the sound. They only time it's loud is pullin a long grade at high rpm with the fifth wheel.

Ringer, I've gone both ways with the cool duals. With the cat in place, there is not much in an increase in sound. Without the cat is another story, alot more turbo noise, and much deeper exhaust note, much better!!! It's too soon to tell if milage has increased.