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Manual states that modifying the emissions system WILL or any modifying for that matter. Depends on the service guy. Call and ask a few different one and see how they feel about mods.
 

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It depends on the year of your truck. If you have an 07 or older it will only void your exhaust system warranty. If you have an 07.5 or newer Dodge has stated they will void the entire warranty. However if the Magnaflow is designed for the 07.5+ then the M&M Act is on your side.
 
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