i have a 89crxsi im puting a zc (dohc) into it. I know that cats can help but what i was wondering if i were to just use the stock si ecu for the smog if that can help improve my chances or even an ecu out of an 88 teg might be better. if someone has done this please i need help asap motor will be hear soon

 

the PM6 is very well matched to the DOHC ZC, the teg ECU is better, PM7 is best

 

that dohc will pass smog just use si intake manifold that motor can be refed ive done it

 

thanks that helps me alot

 

fuel pressure regulator and turn it down before getting there

 

how do you ajust the regulator? can i just pinch a return line?