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splitter
My thought is that NASCAR allows the splitter for safety reasons even though it actually violates the cars body template criteria.
The sides of the car provide the most direct route for the air to go,the bottom is off limits for safety reasons,so the splitter forces the air around the car,where it cannot produce vertical lift or drag if left to go under the car.
The thing about 'street' splitters,is how do you keep them on the car? They violate the approach angle of 16-degrees and even with careful driving,it's a matter of time until you tear them off on a driveway ramp.
You could follow Volvo's lead and make them 'active',deploying only when out of danger.
Re-profiling the nose accomplishes same thing,but there again,you've got to look at clearance.
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