If in fact your Chevy Suburban needs a new catalytic converter you'll need to replace it with an OEM CAT designed for your SUV and approved by the California Air Resources Board (ARB). It must have a stamped EO (executive order) number on it.
We recommend you contact the State Smog Check Parts Locator. The Part Locator Hotline might be able to help you find a California complaint (CARB Approved) catalytic converter for your Chevy Suburban.
You may contact the State Smog Check Parts locator by calling 1-800-622-7733.