Once I put the nerf bars on the correct sides the air control guards fit perfectly. Looks like they should block a lot of unwanted air from getting under the body. I think a nice option piece of bling would be these guards in carbon fiber! After taking the pics I didn't like how the body could still flop around so I covered the ends of the nerf bar with a strip of Velcro. I think it'll help especially on the big outdoor tracks.