I have an 01 burb 1500 4wd. My service engine soon light came on. I had it checked and it seems that I need a new catalytic converter. I am looking into changing it to a direct fit but here's my question. The burb conforms to California Emission, ULEV and is OBDII compliant. I now live in AZ and when I called Magnaflow they are telling me that I need to get a CA legal cat since the PCM may not like what a 49 state legal cat would do. I understand that the PCM has CA specs on it but I cant understand why I can install a 49 state legal cat instead. On a side note, I called Summit and they wont even sell 49 state legal to me since my vehicle is conforms to CA. I told them that according to their site they cannot sell or ship to a CA address, I am in AZ. Any thoughts what I should do. There is atleast a $300 diff between a 49 state legal and the CA legal cat. Hope this makes sense to someone.