I installed a set of JBA headers on my SuperCrew this morning. I have the JBA Evol cat-back system also. All in all the install went very smoothly, no leaks and my seat of the pants meter says it runs a little stronger under full throttle. I'm still waiting for my custom burn on my SuperChip to come back. Once the chip is in this should be a slick set up. Now that they're in I couldn't be happier.