Review on Dorman 674-551 Exhaust Manifold with Built-in Catalytic Converter (Not CARB Compliant), Black by Corby Muin

I bought this cat combo 3 years ago. I screwed up a cat combo and had to get another one, but I figured out why. On my 01 elantra there is another cat behind this cat. If you have trouble passing the inspection or losing power, you'd better check if another one is connected. Mine was almost completely clogged with debris from two other out-of-service cats. I bought the car knowing the ignition coil had failed and fried the original. At first I didn't think to see if there was another cat. You either have to hollow it out or buy another one. Substitution is the only legal way to do this. No problems with queuing, very easy for me. 50,000 km driven, no problems.