I need to replace the Manifold/Cat combo on my 2014 Jeep Cherokee sport 4X4. It was built for California emissions specs as I purchased it in CA but since I now live in TN. will it be okay to get a cheaper aftermarket manifold/cat to install or do I have to go OEM? One mechanic here in TN told me if I put a cheaper aftermarket one on it will keep throwing codes and check engine light, but I don't want to spend $1600 on an OEM man/cat.