Having owned a dyno and seeing first hand the benefits of getting cool/dense air into an engine I am a firm believer that it is worth it to do so. Air density benefits from cool air will be beneficial to ANY engine regardless of its existing power levels. Denser air=more air=more power. On more powerful engines with higher compression ratios where the knock threshold of the engine is closer to the ignition timing that makes peak power the benefit of cooler air can be even more beneficial. I have seen some combinations that could not reach ideal timing with the hot air in an engine compartment. I personally gained 25HP moving the intake on my meteor into cooler air jut due to the ability get get ideal timing into it. On every setup I build every effort is made to pick up air outside of the engine compartment. As for the original question, something similar to this perhaps? https://www.ramairbox.com/
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