Review on Walker Exhaust CalCat Carb 83189: The Ultimate Catalytic Converter with Integrated Exhaust Manifold by Hayden Hart

Just what my old Camry needed. I had a terrible P0420 check engine light. I've tried everything from replacing the O2 sensor, PCV valve, CataClean and countless other things to get rid of the check engine light. The car was really sluggish and the gas mileage dropped from about 28 to 18. I bit the bullet and bought it to replace an old manifold. I replaced it 2 weeks ago, reset the check engine light and drove about 200 miles. driving cycles. The check engine light is off and the vehicle just passed a smoke test. Make sure it is correct for your state. Some states like California have stricter emissions regulations.