2004 CHEVROLET SILVERADO 2500HDyou can order pretuned ecm with safe tunes on it.
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Thread: duramax mileage improvement?
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12-27-2013, 11:18 AM #36Favre is my Hero!!
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Brandon
2004.5 K2500hd LLY Dmax/Allison EC/SB - Minor Mod's
2005 Trailblazer Lt 4x4 - Wife's - Stock
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