Body Lifts for the X are great..they allow larger tires to fit w/o hitting on compression...they do not raise the center of gravity like SL's do...and at least on the X, they are strong and reliable (No known issues).
I have seen other makes with the occaisional problem, if they were designed to hold too much with too few mounts...so that the extra torque on the mounts might break them...but not on the X, which uses 5 mounts per side, and the mounts are all braced and gussetted, etc...a very strong design.
BL's for the old X's come in 3" and 2" versions...ALL of which are made by Performance Accessories, and private labeled and sold by others...with 4x4parts.com being the easiest place to get them.
Bigger than 33's on an X is pushing it, due to front axle limitations/room to steer...unless you are willing to cut off sheet metal, remove/replace fenders, etc....so a 2" BL is all you need to clear 33's.
The 2" BL takes you and two freinds perhaps 4-5 hrs, ~2 pizzas and ~ 2 - 6 packs in your driveway.
The 3" Kills the entire weekend...and proportionally more beer and pizza.
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- TJ
2001 Xterra '03 VG33, SE 5 spd, 305/70/16's, Revolvers, UBSkidderz, Doubled AAL's, 3"SL/2"BL, winch/bumpers, skids, sliders, OBA, Snorkel, pine stripes....
Friends don't let friends drive stock.
http://www.gifsoup.com/view/501230/tj-tackling-crawlers-ridge-o.gif