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This LMM Duramax sounds like a jet engine

Matt stops by with his long-bed LMM Duramax that sounds like a jet taking off. We go over the truck, its setup, and the mods that make it insanely loud, then let it run so you can hear just how wild ...
GM Authority

GM 6.6 Liter LMM V-8 Duramax Turbo Diesel Engine

The 6.6-liter LMM Duramax V8 diesel engine was introduced midway through the 2007 model year, when it replaced the 6.6 liter LBZ Duramax variant. As such, it powered Chevrolet Silverado Heavy-Duty and ...