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i have a megan header with the y pipe. it obviously wiped out all cats however i put a high flow one on after the ultra sensor (the last one). i have read about o2 sims and stuff but what really works? i need exact product and brand b/c i have emissions to pass. it is hard to come up with a solid solution b/c everybody has their opinions but i just wanna keep it simple. thanks
 

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take it to autozone or something and have them check what codes the CEL is throwing. They'll print you out a sheet with codes that are causing the CEL, after that look up what codes each are or post on here what they are, or even search, your not the only one with the same problem.

travis
 

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Your looking to just gap the 02 sensor away. So you need the cell fix. You can get them on ebay. or you can make your own outta the spark plug fittings at any advance auto.
 
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