[John Rogers]

I tried making a larger, single flap a year or so ago for my race car and it made no difference from the smaller factory ones. It went about 75% of the width and hung down about 3.5 inches. It did get lots of inqueries and questions such as "why is your spoiler back there?", etc, so I went back to the stock ones. A neat test is to take many 8 to 10 inch pieces of bright ribbon and tape all over the roof and rear of the car and then drive it with a chase car and video camera so you can see what the air is doing at the rear at different speeds. I think you'll be amazed.