Bad cats will give you Ox sensor codes. Usually lean codes. I would replace COPs & Magnaflow complete exhaust as suggested. Check the AutoAnything website also. I have been lucky shopping around muffler shops getting better prices than dealers with better results and longer warranties! JMO !
My ls was a former drug car out of Florida then the Johnston Police dept had it as an undercover car. So I ended up finding some stash spots and a few goodies in the car. I got pulled over taking my grandmother to the grocery store.
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