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NISTECH »
https://forums.nicoclub.com/nistech-u7581.html
Fri May 28, 2004 10:17 am
That is a mystery to me to I think it likely had to do with emission standards. Trucks did not have to meet the more stringent standards of OBDII till 98. But it could have mearly been to keep the cost down on having to revamp the assembly line. Its really hard to say.