??????????????????????????????????? I don't know what race you were watching but the only follow the leader was in the last 8 laps. How can you have an 'epic finish' when the whole field is in single file with half a lap to go and it takes 5 laps to go anywhere unless you are in the top 3. Stupid drivers need to remember that this isn't 35mph tandem advantage anymore.
Great race, pretty much the whole field put on a great show at one point or another. 11 different leaders Was rooting for Kimball there at the end until his crew chief went full retard and then his engine went.
If they got the majority of the downforce from a proper diffuser NASCAR wouldn't have to do any of this shit. Cars would be wicked fast and would be able to run close.
A diffuser helps with pressure recovery. i.e. filling the void behind the car with air. Also you should actually read my post. I never said that a diffuser reduces overall drag. It produces a lot of downforce for little drag cost. Think about ratio of downforce to drag.