Some people- David Vizard for one- does nott like corrugated flex tubing connecting ANYTHING in an inlet tract. Reason is, airflow is extremely turbulent and is severely limited thru the corrugations. I think it was Vizard that said the effective air flow thru such connections is less than what a smooth tube that is considerably smaller than the inner diameter of the corrugations would deliver.
It may pay dividends to rejet a carb thats tightly connected by hose to any air scoop. Bonneville runners don't because according to one runner, "it messes up the jetting at high speeds and you burn valves". Factory hood scoops used porous foam to 'connect' their scoops and this may be why. An exhaust temp gauge might show this happening before you lose metal.
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