I live in the northern suburbs of chicago. I was wondering if i need a bypass valve if i get a CAI? Do you only have to worry about driving through deep puddles?

yeah. its for deep puddles. but you might as well get it. its like insurance, you might never need it, but if you do, youll be glad you had it.

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Yes, there's a "Replacement for Displacement". Its called Volumetric Efficiency.

This also depends if you have a skid plate on your car that shields you intake from below. I have a CAI with/out a bypass valve and live in rainy Seattle and have not had any problems yet. Like the previous guy said only big puddles can screw you up and you practically have to be fully submurged in a puddle for it to effect the intake. The bumper and skid plate do a good job protecting the intake for the most part though.

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The magic starts at 5500 RPM!

the bypass wont work unless it is COMPLETELY submerged in water too, just thought id throw that in.

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Yes, there's a "Replacement for Displacement". Its called Volumetric Efficiency.

it's cheap insurance but you more than likley wont need it.

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Apexi Boost Gauge, Apexi Meter Control Unit, RMR C/F Gauge Pod, Blitz Fatt DC III, Rexpeed Apex VG

probly wont need it but a bypass valve is cheaper then a never engine.

I had to makke my CAI into a short ram cause of the winter and the rain we have had here in cincinnati cause of the problem of suckimg up water so yeas you should get a bypass valve.

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too fast