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Old 02-03-2009, 01:03 PM   #1
beaviscih
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Default Apexi CAI Users Chime In

I reviewed the installation diagram for my Apexi CAI and noticed they instruct you to install the metal restrictor pill between the IC and BPV. Can someone explain why this is needed and did you install this with your intake? I haven't measured the pill opening but looks to be half the ID of the stock BPV ID.
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Old 02-03-2009, 04:07 PM   #2
rob
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I installed mine because Apexi told me to!

It's obviously used to limit the amount of air that can go back through the intake. It's probably just for noise reduction, or maybe protect the MAF?

-Rob
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Old 02-03-2009, 10:27 PM   #3
beaviscih
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Thanks rob. I planning on following the diagram, but was curious of its purpose. A friend figured with the change in back pressure (with the CAI vs. OEM), additional back pressure was needed on the system. If my Japanese was better I probably would find it in the text instructions, but I'll stick to the diagram and use it.
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Old 02-12-2009, 08:07 AM   #4
leftho0k
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1000 soldiers couldn't protect the legendary MAF from much.
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Old 07-25-2010, 08:23 AM   #5
DumbUglyDragon
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I finally picked one of these up. Installed the restrictor, but the bpv is still loud as hell! lol Anyone every try without the restrictor?
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Old 07-25-2010, 08:44 PM   #6
beaviscih
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I'm not using it. BOV is loud, but no other notable issues.
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Old 05-07-2012, 05:56 PM   #7
carlck19
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it's def louder with the restrictor. wondering what it's for
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