I plan on keeping my truck stock, until the warranty runs out, then I will install the most reliable power adder they have at the time. I have always been power hungry, that is why I have a 660 hp Falcon, but I want a reliable truck to take me anywhere I want to go without problems. Stock, the truck pulls our 5th wheel very well, so for now it will remain stock. It would be nice to pull any grade in overdrive (5th gear in the manual) at 60 mph, pulling 11,000 lbs. We have 6/7 and 8 degree grades here on the left coast, and have had to drop down to 3rd gear a time or two, to keep rpms at 2000 while climbing the grade. That is 45 mph. An extra (safe) 75-100 hp should do the trick. So I will keep watching to see what will be the best power adder when our truck is 5 years old. It will be two years old in April 08, and we only have 9k miles on it now. At that rate, we will see the 5 years way before the 100,000 miles, even with taking the 10,000 mile trip next year.