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For material; ABS, fiberglass, or Corrugated Plastic? cost, durability, ease of manipulation...ect.
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They really would be all about the same, maybe coroplast is not as durable as ABS or fiberglass. Consider
Polymetal; the strength of 5/8" plywood at 1/10th the weight.
I don't know about the air intake, but what I hear is pretty much CAI for power, WAI for economy. If you want to go down that path, I'd look to Autospeed:
Ballistic Bellmouths
Making your own Bellmouths
Building and Testing an Airbox