Depending on your skill level and knowledge of suspension-easy or difficult. I installed at home-2.5 hours ready to drive again. One must have--Spring compressor, if you have no access to a good one-then go to your local Schwabs or other tire shop. Typically they can install in 1 hour, however I borrowed a spring compressor from a local shop and had to enlarge the upper slot of the tool to fit the New Enlarged Titans. (basically all other trucks are smaller

The kit is two polyurethane spacers that replace the factory top strut spacer. What the spacers do is compress your strut/coil more, thus making the rider stiffer and lifting your Titan. Essentially removing any sagging that may be there. I don't think there is a discrepency. Daystar claims 2.5" lift, that happens to be exactly the difference from front to back. I read somewhere else that someone got 2.25" lift. So results may vary. Either way it looks better. Good luck, hope I answered some of your ????s
I have the King Cab SE, Off-road pkg, 4x4, no pics yet.