Quadzilla Stealth 2 Tuner (Race Version 215 Hp) #S2TUNER-R

List Price: $699.00
XDP Price: Discontinued

01-04 GM 6.6L Duramax (LB7)
Mfg. Number: S2TUNER-R
XDP Part Number: QZS2TUNER-R

XDP $5 Pricebeat Guarantee

 Effective 1/23/2013, Quadzilla Performance Technologies has gone out of business. All units will be sold without manufacturer support and or warranty. Units purchased through XDP will be covered by our 30 day satisfaction guarantee. XDP will no longer offer extended warranties on Quadzilla Performance Products.

The Quadzilla Stealth Tuner is the ultimate handheld programmer for the Duramax. While being extremely well-known for being the most powerful handheld tuner ever produced, it also offers many other features that are important to you.


  • LB7 and LLY Tuners in a single unit with 1 price!
  • Base Tuners offer an industry leading 6 performance tunes up to 135hp!
  • Race version tuner for LB7 has an amazing 10 performance tunes up to 215hp!
  • Read and Erase Diagnostic Codes
  • Correct Speedometer for different tire sizes*
  • Removes Top Speed Limiter*
  • Raises the rev limiter up to 4400rpms!
  • Allows for Transmission Retraining
  • Fastest loading tuner on the market
  • Simple in cab installation
  • Increases fuel economy


Precision Tuning

At the heart of the Stealth Tuner is many long hours of precision tuning combined with thousands of miles of real world testing. We combine the use of fuel injection pulse width and injection timing to create the ultimate horsepower and torque curves. The precision tuned timing maps are one of the reasons our tuner has the lowest exhaust temperatures on the market. Perhaps the best part of the Stealth Tuner is the mileage gain that you will see. We all know that a more efficient engine will gain fuel economy and we know exactly where the stock parameters are lacking. Depending on your driving style, you can expect to see a 1-4 mpg increase!




The Quadzilla Stealth Tuner is packed full of power and features for your 2001-2005 Duramax. Among these features are power increases up to 215hp and 415ft lbs of torque on the 2001-2004 models and up to 110hp and 225 ft lbs of torque on the 2004.5-2005 models. Also included in this awesome tuner are the ability to modify your speedometer to compensate for larger tires*, remove your top speed limiter*, retrain your transmission, and read and erase engine and transmission fault codes. All tuners also have the ability to use these user-defined categories without installing an engine tune.




Combine all of this with the best reliability, and you can't go wrong. We offer a 1 yr warranty in the tuner and a LIFETIME warranty on the software! No one else will match this. Quadzilla also offers free updates and revision to the original owner FOREVER.

Additional Information

Install Sheet

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(8 Ratings, 1 Review) Average Rating:
James Edwards (hiiisboro) 8/24/2009 8:15 PM
this is the best tuner. on 90hp on stock truck.i ran 14.60 1/4 mile

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