Just my thoughts here, and I am sure the new part will provide better air flow but, the original GM part is made of a material closer to spring steel than it is to mild steel and the reason is to provide crash resistance. Your tube will kink in a collision and fold up. GM is using more and more of this special steel in the cars to provide more strength and less weight compared to the heavier material required to provide the same protection. I found some steel in the car that I could not cut with a reciprocating air saw. It just took the teeth right off the blade. Not minimizing your accomplishment, just want to start some thought amongst those who think this is the way to go in Lew of safety. Exclusive use on the drag strip is one thing, but to drive on the street is another. Again just my thoughts and congrats on being very inventive. 
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There's more to life than gas mileage
LS3, Whipple, Custom Comp Cam, springs, pushrods, timing set, CAI intake, Apex cold air scoop, Doug Thorley TRI-Y headers, Billet Custom Products baffled Valve covers, Mighty Mouse Catch can, ADM FPCM, ZL1 fuel pump, MSD boost-a-pump, Hex Vent hood vents, ProSport gauges(fuel pressure, AFR, Boost), Corsa, 100 cell Cats. Jannetty remote tuned, Pfadt trailing arms, all parts user installed. No Dyno yet. Manual trans. 3.45 gears.
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