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Diesel Addict
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here is a link some info thats explains the reson they have the egr, http://en.wikipedia.org/wiki/Exhaust_gas_recirculation i guess more or less it returns your unburt fuel(black smoke)to the engine and runs it thru again but it takes power to do that so with egr block it will cut that out.....guys correct me if i'm wrong...
i have a 05 lly dually with 90+k and never touch her and she still running strong or should i say stronger then stock..hope this info helps
 
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