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  1. Chevy Suburban Forum (GMC Yukon XL)
    Hi, I threw a k&n cold air intake and I cut off my mufflers on my 2014 Suburban LTZ. It's been giving me a lean to rich error code. I bought an aftermarket muffler in hopes that would fix it. Do yall think that will help or will I have to go get a tune in order to keep my set up?
    error codes exhaust suburban
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