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.

Quadzilla Stealth Tuner GM Duramax 2001-07' 135 Hp Standard $381.65

Quadzilla Stealth Tuner GM Duramax 2001-04' 215 Hp Race Model $594.15

Quadzilla Stealth Tuner GM Duramax 2007.5 + LMM 110 Hp $424.15

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