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  1. #1

    Default 2003 hd performance/mileage

    Looks like lots of good info in here.I am looking to take advantage of.What would you people do for gas mileage/performance?Change exhaust or get a tunner like diablo sport? My truck is all stock at this time.Thanks for any advice

  2. #2

    Default

    Welcome to the club. I'd start with the Diablo Preditor tuner.

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