Jeth, check out D&H Specialists, I have taken my x there for a consultation, it turned out to still be under warranty, but they really seemed to know the engine and suspension very well. He did say he hasn't worked on many xterras though.
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Formerly:
'00 black XE
ARB, Big O XT's
Now:
'04 Ttan LE CC
"Drink it up, this ones for you, it's been a lovely cruise"-Buffett