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Maybe a little yeah. Ive seen a nice one that goes over to where the a Varis air duct would go and tunnels the air into the stock air box or pop-charger. That would be a sweet NA set up...
there was a thread here recently about inlet pressure based on vehicle speed, and at 65mph, there would be something like 1/100 psi additional inlet pressure from the ram air effect. cold air is already coming thru the opening, but a shield around the air filter would help with keeping the hot air away.