Elvo-Thanks. There is nothing better than hard evidence from the track. I also did experiements with my wide pan car. I did not notice the car get any tighter when I cut out the back. One turn was entered at 53 mph. I do cutout the bumper now on the oval car. So I am half way convinced but not fully convinced. Air going in spoils vacuum. If the car is tighter you have more rear downforce.
That is very nice CNC work and it is anodized as well. I think maybe it was done at work and not at home. All he needs is some front shocks.
Gentlemen please continue our discussion here so that I will not appear to frequently placed on the topics page.
This is a CRC oval car and road car thread very similar to this one continued.
http://www.rctech.net/forum/showthread.php?t=222869