Im running gutted pre-cats with out Mil eliminators and i still passed emissions.
I got a weriod ECU that it takes 3-5 days for the ECU to finish Cycling (dependant on how often i drive) and the CEl to come back on for my gutted pre-cats.
I know a couple of cougars in SOcal that are running MSDS headers fine and ahve not got caught.
You find a cheap shop Asian or Hispanic run, and they usually will not check...or they don;t care if you have them as long as you pass emissions.
Lupe