There's not too many serious drag racers in here eh? I'm thinking about an anti roll bar but it's probably just too much for the street.
An anti-roll bar usually mounts above the rear axle and basically keeps both ends of the rear at the same relative distance from the body of the car. The rear can still go up and down, it just won't lean relative to the body of the car.
If you see a car launch hard at the drags and the left front wheel lifts higher in the air then the right front wheel chances are the car will want to drive to the right. It does this because torque is pushing the left hand tire down while it lifts the right hand tire. Since it's lifting the right tire traction is reduced and the tire spins. All the while the left tire is gripping harder and harder and the car is basically pushed to the right side by the left tire. An extreme example was seen on Pinks when Justin Burcham was pulling wild wheelies in a Fox and the car pulled wicked to the right.
An anti-roll helps in keeping torque from pushing that left tire down and if there is equal pressure on both rear tires traction can be optimized.