Greg posted this on www.clubfrontier.org earlier today:
I have finally taken a pic of a factory Nismo/ Offroad Bilstein and the HD and 5100 series Titan Bilsteins to show the difference in ride height. I have a scale to show the actual difference in in height. 2" of lift at the wheel is about 1.2" at the shock. This shows that just swaping to the HD series will give you about 1/2" of lift. The lowest setting on the 5100 will give about 7/8" lift, then the middle setting would be 1 3/8" lift and the tallest setting would be about 2.5" of lift. These shocks offer no more wheel travel than stock, so by adding more spring preload, you are decreasing your down travle or droop. On a 4wd, you may end up with so much prelaod that the ride starts to get worse, like having to long or heavy coil spring. 2wd should be fine at max lift though. Keep in mind that just going on eshocks and buying a set of these will not just bolt in to your Frontier or Xterra, you must have the factory Nismo or Offroad package as you will need to reuse the lower spring retainer and the upper plate.