Leave it to John Hennessey to throw a supercharger and a tune on every V-8-powered GM vehicle. Take this 2015 GMC Yukon Denali. It's 6.2-liter EcoTec3 V-8 is fitted with Hennessey's HPE650 Supercharger kit that brings the engine's output rating to — like the name suggests — 650 horsepower.
The blower is a 2.9-liter unit that is cooled by a high-flow intercooler system, while a set of high-flow cylinder heads help the engine breath. A new camshaft makes adjusts the valves' operation, adding not only more horses but also a respectable rumble. Lastly Hennessey flashes the Yukon?s ECU with a custom tune. Best of all, the whole deal comes with a 3-year/36,000-mile warranty.[...]