I think it's speed. Take Perris, USAC/CRA, for example. The top cars are runnin 850+ hp motors and gettin it to the track. You can see it well when they come out of turn 2, the cars get up on the rear tires and haul the mail down to 3......I mean really haul the mail. The combo of the motors, tires, chassis that transfer weight very well, and drivers that, like all before them, just can't seem to go fast enough. They're wanting to go faster. The safety equipment is wonderful, helmets, helmet restraints, great seats. Again, I think it's the speed they're goin now. Just my two cents.
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If ya lift ya lose.....and losin ain't an option! 
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