turbo posted by Nis300owner on December 03, 2006 at 11:51 PM
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turbos yet, but I'd say the 600's. Like Yosha said, they are ball bearing which is better than the journal bearings in stock turbos. From what I've been told/read, ball bearings stay spooled longer between shifts causing less lag and more response.
Just do a little searching for either of those turbos and you should find a bunch of information.