Under CA law we've got that taken care of Catalytic converters are covered under Federal law BTW.

"Under the California Emissions Warranty, all emissions related parts are covered for 3 years or 50,000 miles*, and a vehicle-specific list if more expensive emissions related parts is covered for 7 years or 70,000 miles*. In addition, the 8year or 80,000 mile* coverage for the catalytic converter and engine control unit required by Federal law also applies. Also, some 2003 and later models, certified as (PZEV), have 15 year or 150,000 mile* emissions warranties essentially covering any component that causes the Check Engine Light to illuminate."

Federal Emissions Warranty – Under the Federal Emissions Warranty, all emissions related parts arecovered for 2 years or 24,000 miles*, with the catalytic converter and engine control unit (the computer)covered for 8 years or 80,000 miles*.

Check your own State for applicable coverage.