Aerodynamics & Diverting Wind Resistance ?

Yunick13 said
Another thought, either lose the front bumper, and run nerf bars, or maybe consider running a back bumper off a 1st gen Camaro or Firebird as a front bumper. Either one would allow a custom front valance. Another option would be to cut the bottom portion of the front bumper off. Save some weight off the front.
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Believe this or not, I've actually looked and thought to cut the "bottom" portion of the front bumper off for weight loss - at the farthest point forward. But I also wonder if the 'rounded" bumper helps with wind resistance for the underneath. Is it directing air flow ???