Wheelie bar

[Jessica]

An assembly attached to the rear of a car (or truck) that is designed for drag racing. The purpose is to prevent the [front wheels] from lifting too far off the ground, thus avoiding unwanted wind resistance and potentially the front wheels [lifing] so far off the ground that the whole car flips over on its roof.
Typically, a wheelie bar looks like an A with 2 wheels attached to the top of the A with the base being attached to the rear frame of the vehicle along with a spring.
Basically, if you happen to see a car that NEEDS one of these out on the road, dont drag race it. You WILL lose. Cars that need this usually run 10 seconds or less in [the quarter mile].