The build continues this time on Faster With Finnegan, as the motorhome's 400 V-8 gets supercharged and Finnegan, Cotten, and Newbern attempt to make their '78 Class C GMC hang the tires in the air against Pro Wheelstander Mike Mantel and his Little Red Firetruck. The guys solid-mount the rear axle, shift weight, and construct the largest wheelie bar we've ever seen, but will it all work?