Looking for more hill climbing power, better fuel economy and just an all around better more relazed driving experience? We have products to fit your needs! From mild to wild let us help make your next adventure more enjoyable and less expensive!

2003 - 2016 ISC / ISB w/ Common Rail Fuel Injection System

This easy to install and inexpensive product is perfect for that "it has almost enough power" crowd that prefers a more physical installation that allows you to install the unit and forget about it!

HDT-CR4 Module

2003 - 2016 ISC and ISB engines

NO WIRE CUTTING or soldering required.
 These units will have the ability to increase HP by up to 25% by simply connecting to the engines fuel rail pressure sensor with our factory weather proof plug and play connections. Please include the engine serial number when ordering, some years require the connection style to be confirmed prior to shipment.

ISL Rail Connector

Pulling a heavy trailers/tow vehicles or want the best of the best for your rig? The Bully Dog Heavy GT Tuner is for you!

Bully Dog 46500 Heavy Duty GT Power and Fuel Economy ECM Tuner 

With real time engine data on its built in display you can be confident in your engines performance and also keep an eye on how the engine is running! This tuning system allows you to change the 3 power levels, read and clear trouble codes and adjust speedometer limiter settings with ease! This unit is compatible with:

N14 - 1998 - 2000 - 14.9L

ISX 12 - 2010 - 2016 - 11.9L

ISX - 2000-2021 14.9L

ISM - 1999-2010 - 10.8L

ISC - 2007-2016 8.3L

ISL - 2007-2010 - 8.9L

ISL 9 - 2010 - 2016 - 8.9L

ISB - 2007 - 2020 - 6.7L

X15 - 2017 - 2021 - 14.9L

(X15 power levels based off factory HP ratings)


Do you prefer a flash tuner but don't need the benefits of the GT's display? 

No Problem the ECM Tuner is right for you!
All the benefits and compatability of the Heavy Duty GT without the screen making installation more discrete.

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Perhaps you just want to upgrade your gauge display and keep an eye on your engines vitals while still being able to adjust speed limiter settings and also read / clear trouble codes?

The Bully Dog WATCH DOG engine monitor system is right for you! Packed full of functions and handy features this display make a great addition to any Pusher or Puller Coach!