The stock shocks are roughly 12" collapsed, 21" expanded. 9" total travel.
You can fit shocks that collapse to 16-17" though...and expand to a longer than stock length if you want to.
Shocks with 16" - 26" range are pretty popular, 10" total travel...and fit both stock and lifted X's w/o a problem.
The Bilstein 5100's are great, the Rancho's are pretty good.
There's a few others out there, most were less good than those.
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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