Quote:
Originally Posted by Dave-ROR
GM's own documentation contradicts itself. The other manual shows the same picture and mentions reinstalling them after using the car at the track.
Clear as mud is right 
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I'm just going to through them in the trash and never think about them again, I think...honestly logic tells me that they are blocking/deflecting air away from the curved pieces which serve to prevent air from loading up under the tires/axles, meaning the straight pieces can't really be serving a positive purpose under speed.