Let's say, hypotheticly, that someone's catalytic converter fell off on the way to work yesterday, and the vehicle in question (for this example let's say a 1998 S-10 2.0l with 160,000 miles) isn't worth putting any money in to. Now, assuming that our hypothetical vehicle owner lived in a state with no emissions tests, like maybe Michigan, and was morally flexible enough to live with himself after intentionally disabling emissions equipment... how would this imaginary fellow go about fooling his 02 sensor into thinking everything was OK after he put straight pipe in where the cat was? I searched around but couldn't find any threads, but I know that somebody in our grand family of miscreants must know the secret O2 trick. I had heard of threading a spacer in to take the O2 sensor out of the direct path of the exhaust, but that doesn't seem right. I have heard that you crimp the end of the O2 sensor, but that doesn't seem like it'd work either. I searched an s-10 forum too, but those goofs all buy little secret devices that look like runtz, and that leads me to believe that it's just a resistor. Er, I mean, it would lead our hypothetical fellow to think that!