I bought my truck used. The owner that had it before me modified the exhaust. I don't know if it came with a catalytic converter or if one is necessary for smog in California. This is the first year that they are requiring smog. The converter costs 1400 dollars due to the fact that I have no core. If I could get some info on how to find out it would be greatly appreciated. It may save me 1400 dollars. Thanks. Need more details please ask.