My buddies 68 Drag Radial Chevelle runs 7:60's at 165+ in the quarter & we had a starting line incident one time when the car didn't start. The other guy waited patiently for us to get started. Once the track official gave him the go & we finally got it started we did not have enough time to get the removeable deck lid & wing installed & made a pass anyway without them. We won the race & went 2 MPH faster than it ever has. Made me a believer that all of these big wings on the back make no difference. The car is not at speed long enough to notice.