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I think lowering cars and adding air dams made a lot of sense in the '80s (and earlier), when cars were so cobbled up underneath that reducing airflow under the car would guarantee reducing overall aerodynamic drag, but other than the engine compartment, a Metro is pretty smooth on the bottom already, and you can smooth up the engine compartment with ABS or coroplast. I think once you clean up a car's belly belly, you're aren't likely to reduce drag much (if any) by lowering it.
At least, that's my latest theory.
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