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  1. Performance Mods - Engine - 4.7 Liter V8
    Hey yall. I need some advice. I've been looking at adding the K&N 57 series CAI intake to my stock 4.7. Currently I just have a flowmaster 40 series installed. While reading customer reviews on K&N's website, I noticed one stating that the gains were pretty legit, but after "a while" the trucks...
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