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Hmm,
Well, the best place (and untapped) is the underbelly of the car. There is where alot of air is rushing in and can be harnessed (venturi effect). Getting this to really work can be tricky since not everyone has a wind tunnel. But basically the first two things you need are front and rear valences that channel the air correctly. Then on the underside you need vents and deflectors that can also channel the air properly. Bolting on a piece of aluminum under the car shouldn't be too hard, and the off-roading boys can hook people up with places that will pound it to the right shape.
To find a decent shape (as in an educated guess as to what it will look like) copy the design from books that show what effective underbellies look like, and modify the dimensions to fit the Sentras.
Seth
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