There is no way you can comprehend how significant grip is at high speed unless you put your butt in a winged car. I've raced a few regionals in an FE and it still takes me a few laps each session to trust the tires in flat-out corners... then I hate to get off the track when the checkered flag is waved.
If interested, here is a lap at Roebling Road from last weekend's race.
http://youtu.be/mOcEP4Wgnp4