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Typically, proper "ram air" is plumbed to the intake. I'm not sure you'd notice much reduction in temps with a scoop blowing air onto the engine.
The ZL1 already has a heat extractor to remove warm air from under the hood. To reduce underhood temps, your best bet is probably adding additional heat extractors to the hood. Several folks on the forum have added heat extractors to the hood. Some have added to the fenders as well.
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Sold: '99 Trans Am (bolt-ons & cam) | '00 WS6 (bolt-ons, heads, cam, 12 bolt) | '05 CTS-V (bolt-ons, short throw) | '10 SS/RS M6 (short throw, CAI, coilovers, LTs, catback, JRE tune) | '01 WS6
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