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Our SRX is a V6 but the arrangement should be similar. You could go with pvc from the intake to where the current air box is and replace the box with a K&N or equal cone filter. You would probably want to construct some sort of heat shield so only cool air was used.

The stock air filter element is the worst part of the car next to the cheap sunvisors. We went with the Volant due to the much larger filter surface area than stock, the enclosed box to assure only cool intake air like the factory unit, no noise increase and it does not cause any codes to be thrown. We did it at ~2K miles so I cannot definitely say any gains were from the intake or just the car getting broken in.
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