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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 Member

    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 Moderator ROTM Winner 1000 Posts

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

    JimmyA Member

    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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