there werent any california or non california model cars. we all have EGT sensors on the intake manifold...if you remove the EGR, you can cut that too. or just leave it there. you will get codes unless u put a resistor in for part of the EGR system, which i have yet to do since i forget where it goes

http://www.240sx.org/faq/index.html heres a great source. it has the butterfly removal on it and i think some other emissions removal as well.