2015 GMC Denali Project Posted on 12/24/2014 by BBDiesel We just completed a 2015 GMC Denali Project! The 2015 GMC Denali is nice from the factory, but look what happens after making a few simple changes. This owner opted for custom wheels, tires, and lift-kit. 2015 GMC Denali Project 2015 GMC Denali Project #1 Post by BB Diesel Performance.