Intragration
OBS Enthusiast
I would think it unlikely that other things were tuned out. Sometimes cats get clogged, or people just don't like them, so they take them off and tune them out if necessary. You HAVE to tune them out if there's a post-cat O2 sensor and the cat is gone, at least if you want the CEL to remain off. You don't HAVE to tune other things out. Have you confirmed that the CEL lamp still works? It should go on during the pre-start light test.