horsepower, gas mileage, and that badass rumble

Discussion in 'TX - West Texas Chevy Truck Club' started by morepower, Nov 26, 2013.

  1. morepower

    morepower New Member

    I have a 2008 gmc sierra. with the 5.3l. i want to add maximum horsepower without getting to deep into the engine. maybe adding gas mileage and the beautiful rumble of a classic muscle car
  2. reggiecab2000

    reggiecab2000 Epic Member 5+ Years 1000 Posts

    first priority:
    exhaust, preferably long-tube headers back
    programmer/tuner/custom tune

    second priority:
    cold air intake
    throttle body spacer (highly debatable)

    after that you really start getting into the engine....
  3. Enkeiavalanche

    Enkeiavalanche Loving the Outdoors Staff Member 5+ Years ROTM Winner 5000 Posts

    Your MPG's will not be going up much.. Depends on your foot..
  4. JimmyA

    JimmyA Rockstar 4 Years 100 Posts

    FlowMaster Super 10 muffler, dumped over the axle for Rumble, custom tune from a programmer for hp gain (dependant) on foot control. A programmer will not provide much unless you are in the upper RPM range otherwise you will not experience much change. If you want better 0-60mph times or 1/4mi times a gear change is more helpful. As far as MPG goes, don't expect anything better than 1-2mpg increase. Cold Air induction is snake oil, JMHO.
    Last edited: Nov 28, 2013

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