OBD-II is not easy to override without an external device. In states like NY and PA-inspection depends on readings taken from a STOCK ECU for 96 and up cars made by most companies. That is one reason that the connector is now universal and the test fee so high. The old-up the pipe method-may be used in other places, but in our cases poses a serious dilemna. What can you do-very little. The fact is that there is an effort afoot to make it extremely difficult to modify a car-even if the result is better than stock. Go figure.
Simnple answer is the most difficult achieve-move to somewhere that does not have strict emissions tests. Sadly, even that is coming to an end as the Fed imposes rules that are connect to highway funding dollars.