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CEL on header. Even a catted one can throw it because of high flow cats. Plan on tuning your car if you change headers.
No CEL on anything else. Unless the part causes the problem on your car, your warranty is valid.
Oh and UEL doesn't make you lose power if it's properly made. The difference is neglible on a properly tuned NA car. Unless you are pushing 400+ whp, then you'll see a small difference. I love UEL for the sound.
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