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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 10-18-2012, 06:05 PM   #1
DenverSooner
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Join Date: Dec 2011
Location: Castle Rock
Posts: 184
My Ride: 2014 328d xDrive
Dodged a Bullet....

Didn't think I needed to swap out my CAI for the stock until later in the year....

We had a very heavy rain last week and ended up with a transmission light and an SES light. Turns out I had sucked up just enough rain water (even with the hydro shield) to get the MAF wet and probably even got a bit of water in the intake. Pure luck that it wasn't much water and whatever got into the intake, if any, burned off. Whew!
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Old 10-18-2012, 07:01 PM   #2
SamDoe1
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Join Date: Oct 2010
Location: Minnesnowta
Posts: 3,464
My Ride: Clubs baby seals
Did you route your intake way down by the brake duct or what? Also, how many feet of water did you drive through???

The best way to get around this is to use the brake duct as a SECONDARY intake, not the primary. If you punch a hole in the bottom of your stock air box and route a hose to your brake duct, it does the same thing and you never have to worry about this again.
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Old 10-18-2012, 07:15 PM   #3
DenverSooner
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Join Date: Dec 2011
Location: Castle Rock
Posts: 184
My Ride: 2014 328d xDrive
I have (had) an Injen CAI installed which routes down to the brake duct. I did like the bit of pick-up it offered. I really didn't think I drove through much standing water, just heavy rain. Anyway, a few drops made all the issue. Re-installed the stock with a k&n...at least for the winter!
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