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Actually, what tests here by myself and Sentra-SER have shown is that the warm air intake works with MAP cars and not with MAF cars (the opposite descirbed above). Also, most guys have insisted that its not changes in AFR that result in savings, since the ECU will detect less oxygen and adjust fuel. Rather it is that you will open the throttle further to get the same power, thus reducing losses from the effort to pump air past the throttle body. But at any rate, Sentra-SER showed pretty convincingly that it does not work with a MAF. And I wouldn't argue with anyone who has experience with these Volvo engines. I just know that my MAP equipped car has been running a WAI for a year, the last 14000 miles or so, without trouble from it.
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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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