2003 hd performance/mileage

Discussion in 'General Chevy & GM Tech Questions' started by Jt2003, Apr 9, 2011.

  1. Jt2003

    Jt2003 New Member

    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. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

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

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