ok so my cat is bad buying going to buy a new one....
 

Is there anything else i need to buy before i replace it? Going to buy a OEM cat from someone on the forums with 27k on it not bad right? Just wondering if i need anything else before i replace it thanks guys.

No, nothing wrong with it. Just a direct swap. If you haven't, I'd pull up the seller's prior posts to see if they ever posted about flooding their 8, which makes the cat take a big hit, but assuming they didn't, nothing at all wrong with getting a used cat. It will work fine.

cool thanks man you've been a huge help.