I've have to get my car smog'd. My setup is the stock 1.5 dx converted to mpfi obd1. I'm running a 92-95 si intake manifold. and everything else is pretty much stock. i need this motor to pass smog. so i'm wondering what air box will work? i don't know what happened to the stock LX air box. If I can find it, it should work, right?

 

I'd be more concerned about it being converted to OBD1 than an airbox. Have you ever smogged it that way before?

 

OBDI is not a problem. The smogger won't even see a difference.

Either get the stock airbox(an SI box will work for the MPFI) Or a short ram intake or cold air intake with a CARB numbers and you are legal.
Make sure all the vacuum lines are correct also.

You can always upgrade OBD0 to OBDI you can't downgrade OBDI to OBD0.

 

My friend is a smog tech and he said the emissions testing parameters/limits are different between the two (for example, 89 civic with OBD0 D15B2 vs 94 Civic with OBD1 D15B7). How would having it converted to OBD1 effect the actual emissions? Is this something should be disclosed to the smog tech at the time of the smog test?

 

Yes, There are different parameters, how much I don't know. I would have to compare them to see. The rule is smog to the motor.

You can disclose the info or keep it to yourself on the OBD part. He will notice the manifold swap and that is where it turns "Fishy" to us.

He will probably ask you about the IM. If the motor is not the stock one tell him it is a replacement motor and that is it. There shouldn't be a problem. He should have a book that tells him what motor is in what year.

Even if it is a 94 motor you have it covered because you are OBDI.