Nearly 400hp and nearly 800 ft. lbs Gal Banks says they have the six-gun that safely brings the HP on the Duramax to 675 and Torque to over 1200 ft. lbs without voiding the factory warranty. A fully loaded crew cab, 4X4 Duramax/Allison 2500 (is what I have in a 2006) - list price was $48,000, 2015 is now $65,000.
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