how do i lower the nox levels??? its the only thing that i cant pass and its at 3500. would putting in a stock exhaulst help out??? thanks.

 

Try tuning your A/F mixture to a stoicmetric level first.

 

menthanol (just a little bit)
retard your timing (all the way until idle suffers)
change plugs to a colder set
add a cup of bleach to your gas tank

(I take no responsibility for any damage in doing the above actions... do it at your own risk!!)

 

that's funny------------>menthanol (just a little bit)
retard your timing (all the way until idle suffers)
change plugs to a colder set
add a cup of bleach to your gas tank
(I take no responsibility for any damage in doing the above actions... do it at your own risk!!)


Then at the bottom----->1998 Blown EX Do you want to trust this guy?

 

most definitely not!

blown ex means turbo ex.. not a 'blown up' ex (at least not yet)
i was just offering suggestions

 

Retarding timing until idle suffers will increase combustion chamber temps even more and thats the cause of NOx. If you have an exhaust leak, then the stock exhaust may help. Try removing carbon from the combustion chamber with an intake system cleaner, or water misted into the intake pipe with a spray bottle.