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2020 Harley-Davidson GMC Sierra brings the iconic brand to a new truck

The Harley-Davidson Ford F-150 rides alone no longer. Thanks to the Tuscany Motor Company, it now has a fellow truck associate to cruise with side-by-side on the open roads. Introducing the 2020 Harley-Davidson GMC Sierra, which will make its official debut at the 2020 Barrett-Jackson Scottsdale auction. For years, a Harley-Davidson special edition package has been associated with the Ford F-150 nameplate. Although Ford does not offer a direct option from the factory, Tuscany Motor Company answered the demand and now builds truck packages that carry the famous American motorcycle name. With the direction of Harley-Davidson, Tuscany creates interior and exterior customizations that reflect notable and iconic features of the bikes. This year is the first time Tuscany has ever offered a Harley-Davidson package on a GMC Sierra, and as expected, it's pretty similar to the one offered on the F-150. The package includes at least 60 exclusive parts, and the Sierra is available in Onxy Black, Summit White, or Satin Steel Metallic.  Setting the tone are Fatboy-inspired 22-inch milled aluminum wheels wrapped in chunky 35-inch all-terrain tires. As Tuscany is a division of Fox performance parts, the truck rides on a specially designed BDS suspension with tuned Fox shocks and lateral stability bars. The truck also has a redesigned front bumper and grille with an integrated LED light bar for off-roading, power running boards with rock guard trim and entry lights, color-matched Harley-Davidson-designed fender flares, custom front fender vents with the Harley logo, an induction-style hood, a redesigned rear bumper, and a tuned exhaust with billet tips. More badging, tailgate cladding, a windshield header, orange tow hooks, and a bed rug add extra pizzazz. Finally, for all the planes, drones, and aliens who are eyeing pickups from the sky, the tonneau cover is debossed with the Harley-Davidson logo.  Inside, the fan pack includes leather seating with orange diamond stitching, and piano black door panels, console, and trim. Harley-Davidson badging and branding is on the seats, on the center console, on the floor mats, the door sill inserts, the instrument gauges, and even the pedals.  If this is up your alley, and you're interested in buying, the Sierras, no matter the color, start at $94,995 before taxes and fees. For more information, visit Tuscany. Related Video:

Supercharged 2015 GMC Yukon Denali sounds evil, runs 0-60 in 4.5 seconds

Speeding along in a sports car is undoubtedly a ton of fun, but some owners need the ability to carry a lot of people and their stuff and don't want to sacrifice the ability to put the power down. The tuners over at Hennessey have that demographic covered with their growling, supercharged power kits for the GMC Yukon Denali. The upgrades come in three forms for the SUV's 6.2-liter V8: HPE550 with 557 horsepower, HPE600 with 605 hp and HPE650 with 665 hp. This video showcases the full-bore version, and this Denali can definitely hustle in a straight line. The power bump comes courtesy of a 2.9-liter supercharger, intercooler and high-flow cylinder heads to add over 200 horsepower compared to stock, and the final result is a bellowing SUV that rears up off he line to throw the driver back into the seat. The sprint to 60 miles per hour lasts just 4.5 seconds. Check out this hasty hauler in action in the video above.

'Killing a Duramax' Gale Banks YouTube series methodically tunes a diesel to death

Learning or perfecting a skill by watching YouTube videos is known as attending YouTube University. GM Authority picked up on one of the video site's more fascinating courses, hosted by Gale Banks; in a fair world, he should be referred to as Professor Banks when it comes to diesel engines and truck tuning. A few months after GM introduced the updated L5P 6.6-liter Duramax diesel V8 in the 2020 Chevrolet Silverado HD and GMC Sierra HD that ships with 454 horsepower and 910 pound-feet of torque, Banks decided he wanted to methodically tune the engine to death. The purpose of the resulting series, called "Killing a Duramax," is to push more power out of the engine in order to discover which parts break and when — or, as Banks puts it, force-feed the Duramax "until the crank hits the street and the heads hit the hood." With that knowledge, Banks can figure out all the weak points on his way to building what he calls a "Superturbo," that being a supercharged, twin-turbo race engine with more than 1,000 hp. What makes the series fascinating is Banks' knowledge, paired with the company's comprehensive iDash engine monitoring system that keeps tabs on a glut of parameters every step of the way. So for instance, you get Banks explaining the differences between inches of mercury and barometric pressure, how those are different from the water content of the air measured in grains, then showing those readouts on the iDash, then explaining in detail how they affect the air density in the Duramax system. The stock Borg-Warner variable turbo gets a lot of airtime — Banks accuses it of being "out to lunch" because he feels it's the weakest link on the engine. That turns into a turbo teardown and a deep explanation of performance pitfalls, such as when air pressure on the turbine begins to diverge from the boost pressure coming from the compressor. Banks says he can keep close tabs on where power's coming from, because the iDash monitors the horsepower contribution provided by the ambient air, the turbo, and the intercooler separately. The major changes so far are a stouter Precision 7675 turbo and TurboSmart wastegate (episode 5), a twin intake (episode 6), a custom liquid-cooled intercooler from a marine engine, a new GM oil cooler and synthetic oil (episode 10), and new injectors (episode 11).