One of the most popular mods for the HD body style on a Duramax is the lift kit. They can range from the basic "leveler" to a foot high lift. The lift kit changes the truck's suspension, altering the geometry - as they say - and has the potential to make the ride really uncomfortable. That's why we called Nick Vazquez of Cognito Motorsports. The Bakersfield, California company manufacturers high-quality suspension parts and lift kits - so what better group to call to find out the best way to get the most out of a kit and other important suspension parts.