As much as we like the 5.9L Cummins powerplant, the stock exhaust manifold is constrictive and contorted, interfering with the flow of gases to the turbo and downpipe. That, in turn, can produce the ...

The most overlooked and neglected component of a truck’s drivetrain has to be the differential. Most truck enthusiasts accessorize their rigs with lift kits, tires, wheels, grilles, custom paint, ...