Hi Douglas, thanks for initiating contact. As of 2023, Connecticut is already part of the CARB (California Air Resources Board) states in the United States. This means that moving forward, Connecticut will be using CARB catalytic converters. However, if your vehicle previously uses Federal emissions, it's always best to verify the current requirements with the Connecticut Department of Motor Vehicles (DMV) or a qualified mechanic who is knowledgeable about emissions regulations in the state. I suggest calling our parts specialists at 1-866-529-0412 for assistance so we can help you look for the right part. Have a good one.