Quote:
Originally Posted by AndrzejM
I think that Metro has a point, and as you can see below the "ideal" aerodynamic profile is way different from the back of my 318 Compact.
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But the ideal profile is much longer than your car. You can't just have it end abruptly and still expect any benefit just because you followed that profile half way to its conclusion. With that modification you create a much larger low pressure zone behind your car.