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We found 333 results matching your criteria.

Diesel Tuners for Cummins, Duramax, Powerstroke

Tuners intercept the signal that the ECU or engine control unit shoots out to the injection system, allowing precisely the correct amount of fuel to be squirted into the injectors. This is will create noticeable gains in torque and power. The modern diesel engine is packed to the brim with sensors that are manipulated and told what to do by the Engine Control Unit of a vehicle, so tuners are a great way to help the engine to run efficiently. Fuel consumption will even show gains as the vehicle will be using less throttle than it used to.

Diesel Tuners - Diesel Programmers Diesel Gauge Monitors EGT Probes & Sensors

Diesel Tuners-Programmers

Diesel Gauge Monitor

Diesel EGT Probe Sensor Kits

Tuner Mounts & Accessories

Diesel Gauge Monitor Pod-Pillar Mount

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Bully Dog 40425 50-State GT Diesel Gauge Display and Tuner for 2007-2010 Dodge Cummins 6.7L 2003-2007 Ford Powerstroke 6.0L, 6.4L  Trucks Bully Dog 40420 Triple Dog GT Diesel Gauge Display and Tuner for 2001-2014 GM Duramax 6.6L 2003-2014 Dodge Cummins 5.6L, 6.7L 1999-2014 Ford Powerstroke 7.3L, 6.0L, 6.4L, 6.7L Trucks Superchips Flashpaq 1841 California Version Programmer for Ford Powerstroke Superchips Flashpaq 3841 California Version Programmer for Dodge Cummins
Application:
2007-2010 Dodge Cummins 6.7L 2003-2007 Ford Powerstroke 6.0L, 6.4L
  • California Legal
  • 4-in-1 Device (Engine Tuner, Monitor, Gauge, and Diagnostic Device)
  • Instant Access to Information that OEMs Don’t Display
Application:
2001-2014 GM Duramax 6.6L 2003-2014 Dodge Cummins 5.6L, 6.7L 1999-2014 Ford Powerstroke 7.3L, 6.0L, 6.4L, 6.7L
  • Full Color 2.4" LCD Monitor
  • 4-in-1 Device (Engine Tuner, Monitor, Gauge, and Diagnostic Device)
  • Maximize Vehicle’s Fuel Economy
Application:
2008-2010 Ford 6.4L Trucks
  • California Compliant - CARB EO Sticker
  • Ready to Use
  • Internet Updateable
Application:
1998.5-2012 Dodge 5.9, 6.7 Trucks
  • California Compliant - CARB EO Sticker
  • Ready to Use
  • Internet Updateable
Bully Dog 40400-102 Windshield Mount  for WatchDog - GT Tuners Bully Dog 40400-105 WatchDog & GT OBDII Block  for WatchDog - GT Tuners Superchips Flashpaq 1842 Programmer for Ford Powerstroke Trucks Superchips Flashpaq 2842 Programmer for GM Duramax Trucks
Application:
WatchDog - GT Tuners
  • Easy to Install
  • Mounts to the Windshield
  • Unit is Fully Adjustable
Application:
WatchDog - GT Tuners
  • Easy to Install
  • Plug in Under Dash to Connect with Device
  • Replacement or Spare OBDII Block
Application:
1999-2015 Ford 7.3L, 6.0L, 6.4L, 6.7L Trucks
  • Performance, Towing, & Fuel Economy Tunes
  • Ready to Use Out of the Box
  • Internet Updateable
Application:
2001-2014 GM 6.6L Trucks
  • Performance, Towing, & Fuel Economy Tunes
  • Ready to Use
  • Internet Updateable
Superchips Flashpaq 3842 Programmer for Dodge Cummins Trucks Banks Power 61146 iQ Dashboard PC 2007.5-2010 GM 6.6L Duramax Banks Power 66517 Bullet Diesel Tuner 2001-2004 GM 6.6L Duramax Smarty S-03 Tuner - SM S-03
Smarty S-03 Tuner
Low Price: 649.00
Application:
1998.5-2012 Dodge Trucks
  • Performance, Towing, & Fuel Economy Tunes
  • Ready to Use
  • Internet Updateable

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2007.5-2010 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2007.5-2010 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003-2007 Dodge 5.9L Cummins 2500/3500

1998-2002 5.9L Dodge Cummins
Smarty S-06 PoD Tuner - SM S-06POD Smarty S-67 Tuner - SM S-67 Smarty J-06 Junior PoD Tuner - SM J-06 Smarty J-67 Junior Tuner - SM J-67
Smarty S-06 PoD Tuner
Low Price: 685.00
Smarty S-67 Tuner
Low Price: 685.00
Smarty J-67 Junior Tuner
Low Price: 495.00

2003-2007 5.9L Dodge Cummins

2007-2009 6.7L Dodge Cummins

2003-2007 5.9L Dodge Cummins

2007-2009 6.7L Dodge Cummins
Banks Power 61022 Six-Gun Diesel Tuner with Switch 2003-2005 Dodge 5.9L Cummins Banks Power 61022 Six-Gun Diesel Tuner with Switch 2003-2005 Dodge 5.9L Cummins Banks Power 61141 iQ Dashboard PC 2001-2005 GM 6.6L Duramax Banks Power 61142 iQ Dashboard PC 2001-2005 GM 6.6L Duramax

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003-2005 Dodge 5.9L Cummins 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003.5-2007 Ford 6.0L Powerstroke F-250/350

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2001-2005 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2001-2005 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2001-2005 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2001-2005 GM 6.6L Duramax Sierra 2500/3500
Banks Power 61144 iQ Dashboard PC 2006-2007 GM 6.6L Duramax Banks Power 61145 iQ Dashboard PC 2006-2007 GM 6.6L Duramax Banks Power 61148 iQ Dashboard PC 2003-2007 Dodge 5.9L Cummins Banks Power 61149 iQ Dashboard PC 2003-2007 Dodge 5.9L Cummins

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2006-2007 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2006-2007 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2006-2007 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2006-2007 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003-2007 Dodge 5.9L Cummins 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003-2007 Dodge 5.9L Cummins 2500/3500
Banks Power 61151 iQ Dashboard PC 2003.5-2007 Ford 6.0L Powerstroke Banks Power 61152 iQ Dashboard PC 2003.5-2007 Ford 6.0L Powerstroke Banks Power 61155 iQ Dashboard PC 2008-2010 Ford 6.4L Powerstroke Banks Power iQ Dashboard PC-PDA Replacement System - BA 61156

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003.5-2007 Ford 6.0L Powerstroke F-250/350

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003.5-2007 Ford 6.0L Powerstroke F-250/350

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2008-2010 Ford 6.4L Powerstroke F-250/350
Application:
All Dodge, Ford & GM Diesel Vehicles
Equipped with an OBD-II Connection
  • Replacement PowerPDA System Upgrade for
    Six-Gun/EconoMind w/PDA docking station owners
  • Complete Man-Machine Interface
Banks Power 62781 BigHoss Diesel Tuner 1998.5-2000 Dodge 5.9L Cummins Banks Power 62782 BigHoss Diesel Tuner 2001 Dodge 5.9L Cummins Banks Power 62783 BigHoss Diesel Tuner 2002 Dodge 5.9L Cummins Banks Power 63713 EconoMind Diesel Tuner 2004.5-2005 GM 6.6L Duramax

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 1998.5-2000 Dodge 5.9L Cummins 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2001 Dodge 5.9L Cummins 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2002 Dodge 5.9L Cummins 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2004.5-2005 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2004.5-2005 GM 6.6L Duramax Sierra 2500/3500
Banks Power 63715 EconoMind Diesel Tuner 2004.5-2005 GM 6.6L Duramax Banks Power 63717 Six-Gun Diesel Tuner 2004.5-2005 GM 6.6L Duramax Banks Power 63715 EconoMind Diesel Tuner 2004.5-2005 GM 6.6L Duramax Banks Power 63715 EconoMind Diesel Tuner 2004.5-2005 GM 6.6L Duramax

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2004.5-2005 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2004.5-2005 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2004.5-2005 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2004.5-2005 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003-2005 Dodge 5.9L Cummins 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003-2005 Dodge 5.9L Cummins 2500/3500
Banks Power 63727 EconoMind Diesel Tuner 2001-2004 GM 6.6L Duramax Banks Power 63727 EconoMind Diesel Tuner 2001-2004 GM 6.6L Duramax Banks Power 63729 Six-Gun Diesel Tuner 2001-2004 GM 6.6L Duramax Banks Power 63727 EconoMind Diesel Tuner 2001-2004 GM 6.6L Duramax

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2001-2004 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2001-2004 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2001-2004 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2001-2004 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2001-2004 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2001-2004 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2004.5-2005 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2004.5-2005 GM 6.6L Duramax Sierra 2500/3500
Banks Power 63727 EconoMind Diesel Tuner 2001-2004 GM 6.6L Duramax Banks Power 63739 Six-Gun Diesel Tuner 2004.5-2005 GM 6.6L Duramax Banks Power 63743 EconoMind Diesel Tuner 2003.5-2007 Ford 6.0L Powerstroke Banks Power 63745 EconoMind Diesel Tuner 2003.5-2007 Ford 6.0L Powerstroke

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2004.5-2005 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2004.5-2005 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2004.5-2005 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2004.5-2005 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003.5-2007 Ford 6.0L Powerstroke F-250/350

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003.5-2007 Ford 6.0L Powerstroke F-250/350
Banks Power 63727 EconoMind Diesel Tuner 2001-2004 GM 6.6L Duramax Banks Power 63727 EconoMind Diesel Tuner 2001-2004 GM 6.6L Duramax Banks Power 63749 Six-Gun Diesel Tuner 2003.5-2007 Ford 6.0L Powerstroke Banks Power 63763 EconoMind Diesel Tuner 2001-2004 GM 6.6L Duramax

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003.5-2007 Ford 6.0L Powerstroke F-250/350

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003.5-2007 Ford 6.0L Powerstroke F-250/350

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003.5-2007 Ford 6.0L Powerstroke F-250/350

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2001-2004 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2001-2004 GM 6.6L Duramax Sierra 2500/3500
Banks Power 63765 EconoMind Diesel Tuner 2001-2004 GM 6.6L Duramax Banks Power 63767 Six-Gun Diesel Tuner 2001-2004 GM 6.6L Duramax Banks Power 63797 Six-Gun Diesel Tuner 2006-2007 Dodge 5.9L Cummins Banks Power 63807 EconoMind Diesel Tuner 2003-2005 Dodge 5.9L Cummins

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2001-2004 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2001-2004 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2001-2004 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2001-2004 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2006-2007 Dodge 5.9L Cummins 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003-2005 Dodge 5.9L Cummins 2500/3500
Banks Power 63807 EconoMind Diesel Tuner 2003-2005 Dodge 5.9L Cummins Banks Power 63809 Six-Gun Diesel Tuner 2003-2005 Dodge 5.9L Cummins Banks Power 63807 EconoMind Diesel Tuner 2003-2005 Dodge 5.9L Cummins Banks Power 63807 EconoMind Diesel Tuner 2003-2005 Dodge 5.9L Cummins

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003-2005 Dodge 5.9L Cummins 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003-2005 Dodge 5.9L Cummins 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2006-2007 Dodge 5.9L Cummins 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2006-2007 Dodge 5.9L Cummins 2500/3500
Banks Power 63819 Six-Gun Diesel Tuner 2006-2007 Dodge 5.9L Cummins Banks Power 63793 EconoMind Diesel Tuner 2006-2007 Dodge 5.9L Cummins Banks Power 63795 EconoMind Diesel Tuner 2006-2007 Dodge 5.9L Cummins Banks Power 63857 EconoMind Diesel Tuner 2006-2007 GM 6.6L Duramax

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2006-2007 Dodge 5.9L Cummins 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2006-2007 Dodge 5.9L Cummins 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2006-2007 Dodge 5.9L Cummins 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2006-2007 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2006-2007 GM 6.6L Duramax Sierra 2500/3500
Banks Power 63857 EconoMind Diesel Tuner 2006-2007 GM 6.6L Duramax Banks Power 63859 Six-Gun Diesel Tuner 2006-2007 GM 6.6L Duramax Banks Power 63863 EconoMind Diesel Tuner 2006-2007 GM 6.6L Duramax Banks Power 63865 EconoMind Diesel Tuner 2006-2007 GM 6.6L Duramax

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2006-2007 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2006-2007 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2006-2007 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2006-2007 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2006-2007 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2006-2007 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2006-2007 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2006-2007 GM 6.6L Duramax Sierra 2500/3500
Banks Power 63867 Six-Gun Diesel Tuner 2006-2007 GM 6.6L Duramax Banks Power 63883 EconoMind Diesel Tuner 2007.5-2010 GM 6.6L Duramax Banks Power 63885 EconoMind Diesel Tuner 2007.5-2010 GM 6.6L Duramax Banks Power 63897 EconoMind Diesel Tuner 2007.5-2010 GM 6.6L Duramax

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2006-2007 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2006-2007 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2007.5-2010 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2007.5-2010 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2007.5-2010 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2007.5-2010 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2007.5-2010 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2007.5-2010 GM 6.6L Duramax Sierra 2500/3500
Banks Power 63898 EconoMind Diesel Tuner 2007.5-2010 GM 6.6L Duramax Banks Power 63899 Six-Gun Diesel Tuner 2007.5-2010 GM 6.6L Duramax Banks Power 63907 Six-Gun Diesel Tuner 2008-2010 Ford 6.4L Powerstroke Banks Power 63919 Six-Gun Diesel Tuner 2008-2010 Ford 6.4L Powerstroke

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2007.5-2010 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2007.5-2010 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2007.5-2010 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2007.5-2010 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2008-2010 Ford 6.4L Powerstroke F-250/350

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2008-2010 Ford 6.4L Powerstroke F-250/350
Banks Power 66505 Big Hoss Module 1994-2003 Ford 7.3L Powerstroke Banks Power 66514 Gauge Style Six-Gun Diesel Tuner 1999-2003 Ford 7.3L Powerstroke Banks Power 66515 Gauge Style Six-Gun Diesel Tuner 1999-2003 Ford 7.3L Powerstroke Banks Power 66513 Gauge Style Six-Gun Diesel Tuner 1999-2003 Ford 7.3L Powerstroke

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 1994-2003 Ford 7.3L Powerstroke F-250/350

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 1999-2003 Ford 7.3L Powerstroke F-250/350

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 1999-2003 Ford 7.3L Powerstroke F-250/350

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 1999-2003 Ford 7.3L Powerstroke F-250/350
Banks Power 66516 Bullet Diesel Tuner 2001-2004 GM 6.6L Duramax Banks Power 66517 Bullet Diesel Tuner 2001-2004 GM 6.6L Duramax Banks Power 66516 Bullet Diesel Tuner 2001-2004 GM 6.6L Duramax Banks Power 66516 Bullet Diesel Tuner 2001-2004 GM 6.6L Duramax

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2001-2004 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2001-2004 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2001-2004 Chevrolet 6.6L Duramax Silverado 2500/3500
  • 2001-2004 GM 6.6L Duramax Sierra 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003-2007 Dodge 5.9L Cummins 2500/3500

Banks Power for the following Diesel Pickup Truck(s):

    Full Vehicle Application List:
  • 2003-2007 Ford 6.0L Powerstroke F-250/350
   
 
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Diesel Tuners at OC DIESEL

These tuners even allow for changes as minute as injector open time, allowing the perfect amount of fuel to enter the system, increasing torque and horsepower output. Some add as much as 100 horsepower and 200 lb/ft of torque! Pyrometers are a common addition to tuner packages, as the monitoring of EGT levels is very important after a tuner is installed. Transmission shifting patterns are another common change made by a tuner, which will assist in matching the rest of the truck’s increased level of performance.