i asked racers supply if they carried cat simulators for a yukon and they said no, but gave me the number for Caspers Electronics at 847-247-0484 and they had 'em for $89 a pair.
this let's you remove the cats without screwing up your puter. just thought someone might want to know.
<font face="Comic Sans MS">It'll still probably screw things up at least a little, because it won't be a true reading, and the computer goes on thinking everything's ok when it might actually need to adjust the mixture a bit more... [img]/wwwthreads_images/icons/crazy.gif[/img] Just a thought though..</font>
The 'ol boy i talked to stated that the sensor in front of the cat did all of the adjusting, the one behind the cat, the one we're talking about, only monitors the function of the cat making sure it's operating correctly, if it isn't operating correctly then it cuts on the service engine soon light, but that's all.
i don't know, i am just repeating what he said.