My emissions is due soon and I have an appointment booked for early next week to get tested. I will be driving the car on the highway and make sure I do a couple of WOT runs before taking it in.

Now, my question is, what other precautions should I take? I know the y-pipe has been an issue for a few people. Would the JWT ECU's custom fuel maps be a problem at all? Should I swap back to stock ECU just for the test?

Should I get an oil/filter change beforehand? It has been about 2000 miles since my last change.

Should I bother with any additives beforehand or before I fill my next tank of gas (probably tonight)?

Thanks for any advice.

 

If you have no codes on the ECU you should be fine. Just get it nice and hot and you WILL be fine.

 

If you are due for an oil change, I'd go ahead and due it. Suprisingly, it does help the emissions.