The rig has been on a few local wheeling runs and performed flawlessly. Took it out to CO, UT, and NM and was very pleased with the way it worked. It had one stumble at high altitude. I occasionally get a lean code at idle and one came in while refueling in Moab. I didn't reset the code as we were trying to hustle back to the trails. Later that day, as we were steadily gaining altitude, the truck stumbled and stalled. Acted as though it had no fuel. Once the code was reset it fired right up and ran fine. I can only assume that the code somehow locked the ECM fuel mapping, causing the issue.
Other than that, my only minor complaint would be off road fuel range. Towing a 1,500 lb trailer it only gets about 9-10mpg. Two spare Jerry cans of fuel was sufficient out west, but I'm still considering a long range tank.
Overall, it is still the single best modification I made to this truck. It pulls like a freight train compared to stock, cruises at 70-75 mph on the highway at roughly 2,000 RPM, sounds awesome, and does better on fuel than stock. It is currently our daily driver, and I've got no regrets about the swap. If you have the ability to do it, or the funds to pay for it, go for it! You won't be sorry.