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Intake will give a dealer reason to deny an engine warranty claim. DO NOT do an intake if you're trying to preserve your engine warranty. The MAF is the PRIMARY sensor for determining the air/fuel ratio. Messing with the area around it is a surefire way to claim it was the cause of any engine troubles. That the FIRST thing a dealership will point to.
Stay away from intakes if you are worried about engine troubles.
Cat-backs are fine. They are installed after any sensors and after the main exhaust restrictions (the cats). A cat-back will not be cause to deny an engine warranty claim.
Just remember that a dealership CANNOT void your warranty. They can only deny a claim if a modified part caused the issue.
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