I have a friend who has access to Nissan techinfo and he promised to pass on to me the entire dealer's service manual, who was just posted by Nissan for the US dealers. It looks like they are using recirc valves..
PLEAZURE in SD
Matt 91TT Aztec Red stg IV+
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First look at the VR38DETT Engine Control System - PLEAZURE in CA (SD)18:57:06 07/14/08