mike327

had custom h pipes installed. no check engine light! runs happy. i do have a programmer for when i installed 4.10s. should i choose 'no cats' on my tune? or just leave it be? thanks

dawson1112

Yea choose no cats if you have deleted them, it will eventually trip the cel for catalysts failure. Mine comes on because of not having cats, but if I clear it, it usually takes a 50 mile drive cycle and the light comes back on.