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Hypertech 121072

Thermo Master Power Chip 1991 C2500/C3500, K2500/K3500 454

Hypertech 121072

533-121072

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Estimated ship date 08/21/17 if Ordered Today
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Hypertech 121072 Thermo Master Power Chip 1991 C2500/C3500, K2500/K3500 454 $145.99
Hypertech Thermo Master Power Chip
  • 1991 C2500/C3500, K2500/K3500 454
  • Automatic Transmission
  • 3.42 and 3.73 Rear Axle Gear Ratio

  • Specifications:

    Quantity
    Sold individually
    Manufacturer's Part Number:
    121072

    Plug-In Performance for 1980's and 1990's GM Vehicles

    The premiere name in classic automotive ECM programming, Hypertech became famous with this replaceable power chip, or "PROM", for older vehicles. Before the OBD-II port, OE computer chips on the ECM had to be physically replaced. Hypertech's Thermo Master Chip is one of the best PROMs available. It can create instant power by adjusting spark advance and air/fuel ratio. Such adjustments can also increase fuel mileage potential with sensible driving. Designed for use with a PowerStat 160° or 180° Thermostat, Thermo Master Chips eliminate tuning guesswork... just plug in and drive.

    Does Hypertech 121072 fit your vehicle?

    Narrow Results

    1991 GMC K2500 PICKUP

    • Fitment_Note: Cool Fan Switch Recommended If Equipped w/Electric Fans
    • Liter: 7.4
    • SubModel: SIERRA
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1991 GMC K2500 PICKUP

    • Fitment_Note: Cool Fan Switch Recommended If Equipped w/Electric Fans
    • Liter: 7.4
    • SubModel: SIERRA SLX
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1991 GMC C3500 PICKUP

    • Fitment_Note: Cool Fan Switch Recommended If Equipped w/Electric Fans
    • Liter: 7.4
    • SubModel: SIERRA
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1991 GMC K3500 PICKUP

    • Fitment_Note: Cool Fan Switch Recommended If Equipped w/Electric Fans
    • Liter: 7.4
    • SubModel: SIERRA SLE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1991 GMC C3500 PICKUP

    • Fitment_Note: Cool Fan Switch Recommended If Equipped w/Electric Fans
    • Liter: 7.4
    • SubModel: SIERRA SLE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1991 GMC C2500 PICKUP

    • Fitment_Note: Cool Fan Switch Recommended If Equipped w/Electric Fans
    • Liter: 7.4
    • SubModel: SIERRA SLE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1991 GMC K2500 PICKUP

    • Fitment_Note: Cool Fan Switch Recommended If Equipped w/Electric Fans
    • Liter: 7.4
    • SubModel: SIERRA SLE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1991 GMC K3500 PICKUP

    • Fitment_Note: Cool Fan Switch Recommended If Equipped w/Electric Fans
    • Liter: 7.4
    • SubModel: SIERRA
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1991 GMC C2500 PICKUP

    • Fitment_Note: Cool Fan Switch Recommended If Equipped w/Electric Fans
    • Liter: 7.4
    • SubModel: SIERRA SLX
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1991 GMC C3500 PICKUP

    • Fitment_Note: Cool Fan Switch Recommended If Equipped w/Electric Fans
    • Liter: 7.4
    • SubModel: SIERRA SLX
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1991 GMC K3500 PICKUP

    • Fitment_Note: Cool Fan Switch Recommended If Equipped w/Electric Fans
    • Liter: 7.4
    • SubModel: SIERRA SLX
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1991 GMC C2500 PICKUP

    • Fitment_Note: Cool Fan Switch Recommended If Equipped w/Electric Fans
    • Liter: 7.4
    • SubModel: SIERRA
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )
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