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This is a good workable idea, I can say from experience, but I might be able to save you the cost of the CAI. I get IATs 30-45 degrees above ambient in my 98 DX using dryer hose directly from the stock airbox to the manifold. No money spent on an aftermarket intake, but my DX has a different intake design than your HX. Still, I did not cut-up the airbox, and I don't think you need a CAI to modify in order to have a fully reversible mod.
Also, the cooler temps are affecting your warm-up times and your tire pressure as well as density of the airflow.
Good luck... report on how you execute the mod?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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