There is a hidden "catch" to redeeming the CARB compliant warranty. Before purchasing my replacement cat., I spoke with Walker Exhaust and Magnaflow about buying a CARB compliant cat. with the longer warranty for my Honda which resides in a non-CARB state (Virginia). Both companies advised me to buy the cheaper non-CARB compliant cat. because redeeming the 5 yr./ 50K mi. CARB warranty requires producing a failed emissions test certificate from a state which adheres to CARB emissions standards (e.g., California, Washington, Colorado, etc.). The warranty is not honored for vehicles registered in a non-CARB state.