Ok so i used a aftermarket part but it was recommended as a good brand (walker) my check engine light had been on and a mechanic told me the sound was definitely the cat. Also auto zone ran the codes and it said something about the cat. I've also replaced plugs and had a tune up and my tires are fine but my gas mileage is horrible! My brother did the job and reused and made the best of the rubber ring seal thing because the one i purchased was not right. He also used new bolts because one stripped that were also not an exact dealer fit. Could this if caused an issue? My engine light has stayed off after being reset. I've replaced the air filter. What could be the problem? Thanks for any advice i just can not afford what a shop wants to charge for these problems and i have allot of trouble trusting shops as well I've been done dirty a few times by them.
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