H&S Performance 209006 Duramax LMM XRT Pro Street Tuner

07.5-10 GM 6.6L Duramax LMM
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The H&S XRT Pro Street Tuner will ONLY work with the factory emissions equipment installed. 

The XRT Pro Street tuner is the perfect combination of high performance and value. The XRT Pro Street offers multiple power levels to exactly match your needs. Whether you simply want some extra power to pass when towing, or want an all-out high performance tune, the XRT Pro Street has you covered!

Power Levels
(DPF Present Only)
Power Levels can be adjusted on-the-fly at the touch of a button after Installing the Download to the vehicle. To adjust the Power Level, select Change Power Level from the Main Menu.

  • Stock HP
  • Tow: 40HP
  • Street: 80HP
  • Performance: 120HP

Speed Limiter
This option allows for the adjustment of the factory speed limiter. Most 6.6L LMM Duramax trucks have a 98 MPH speed limiter from the factory. The limiter can be adjusted from 50 MPH to 95 MPH or removed completely. This option can only be adjusted during the Install Download process.

Tire Size Calibration
This option allows for the re-calibration of the factory speedometer to adjust for non-stock sized tires. For the most accurate speedometer reading when using non-stock sized tires, it is best to measure the diameter of the tire using a tape measure rather than going by the printed tire size. In additon, using a GPS is a great way to dial in your factory speedometer. Entering a larger tire size will cause the factory speedometer to read higher while entering a smaller tire size will cause the factory speedometer to read lower. The tire size can be adjusted from 25” to 60”. This option can only be adjusted during the Install Download process. Note: On some vehicles, entering a tire size larger than 35” may cause the ABS light to illuminate.

Transmission Reset / Relearn
The automatic transmission on the 2007.5 – 2010 6.6L LMM Duramax has what is called Adaptive Memory and is constantly learning and adapting to different horsepower levels, temperatures, driving habits, etc. We highly recommend performing a Transmission Reset / Relearn procedure after installing H&S tuning to help the transmission perform correctly with the added horsepower. The transmission will eventually learn over time on its own, but the relearn procedure gives a good baseline for the adaptive learning and helps to speed up the learning process.

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