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thinking of putting a cfm intake manifold, k&n cold air intake, and a mbrp 4" turbo back exhaust on 05 5.9 cummins truck already has a hypertech maxx energy and fitch fuel cat installed do you recommend these future mods or any other mods that would benifit mpg for towing daily
 

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Yep, make sure your front tires are aired up to between 70 and 80 psi, change your axle lubricant for synthetic, and don't put a k&n air filter on a diesel you want to last for hundreds of thousands of miles (they don't seem to filter as fine particles as other types, and yes I've seen this firsthand several times by rubbing my finger inside air ductwork after k&n's and finding dust that I don't find with paper filters).
 

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Good catch-it didn't even occur to me.
 
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