I went from built motor, dual CP3, big-ish twins, etc (probably in the neighborhood of 850 hp) to a stock engine, stock turbo, stock injectors, everything. I sometimes miss the power, but I don't miss breaking stuff. I didn't put it back 100% stock. I kept the built trans and lift pump, and I still throw a race tune in from time to time, but I usually run around on a 400 to 450 hp tune. I'm glad I went back to stock because I love my truck, and even with the smaller tunes, it's still a lot of fun to drive. After having it down for a combined total of about 18 months for various breakages, I decided it was too nice of a truck to not be able to drive, and if I ever have a built motor, high horsepower truck again, it will be a toy instead of a daily driver.