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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 11-14-2008, 09:59 PM   #1
LABMW13
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My AIR BOX MOD - With pics and steps - Adding a third air Channel

So I decided to try the Air Box Mod, I know there are other threads but this is my version with pictures and step-by-step instructions. My version does not cut into the brake duct; instead I drilled into the bottom of the splash panel. I noticed a difference as soon as I started up, slightly louder and more rev happy. So here is how I did it. Time was around 30 mins with pics and cost was less than $10…So it’s worth a shot. See pics for referencing.
You will need:
• 2 1/4 in. Flexible Exhaust Repair Kit From Autozone - $6.99 Photobucket
• Hose Clamp 2 pack - $2.49 Autozone
• Screen - Free (if you have some laying around, I used old window screen)
• Scissors, Drill + accessories, Wrench + socket kit
• 30 Mins of time
Photobucket

1. Take off the air box and bumper. Photobucket

2. Cut a hole in the bottom of the splash panel. I used a 2 1/8” drill and then filed the rest so that tubing would fit. Photobucket

3. Place the tubing into the hole and run it up to the location of the air box. Place the air box in its location and mark where the tubing and air box touch. Then drill a hole in to the box and file so that the tubing fits comfortable through the hole. Photobucket

Photobucket

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4. Now put the tubing aside and bolt in the air box. Then run the tubing through the box to the hole in the bottom of the splash panel. Photobucket Photobucket

5. Clamp both ends of the tubing to keep it secure, I put screen on both ends to keep bugs and debris from getting in to the air box. Photobucket

6. Lastly put your filter back, close up the air box and put the bumper back on and you’re done. Photobucket
Photobucket


Overall I am satisfied with the way it turned out and it was fairly simple (assuming you know how to take off the bumper). The third air channel is about the size of the first two put together...Exact gains are currently unknown but I do notice a difference.
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Old 11-14-2008, 11:48 PM   #2
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Good Job!!
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Old 11-14-2008, 11:55 PM   #3
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nice! i gotta do this
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Old 11-15-2008, 09:20 AM   #4
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i have did the same with a 3in flex intake hose, ad a funnel deal at the bottom, seal it up for winter!
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Old 11-17-2008, 07:20 PM   #5
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Good Job!!
Quote:
Originally Posted by 00bmw323 View Post
nice! i gotta do this
Thanks...it seems to be helping a little with the mpg's too!!
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Old 11-17-2008, 07:22 PM   #6
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i have did the same with a 3in flex intake hose, ad a funnel deal at the bottom, seal it up for winter!
Yeah today it just started to snow but i haven't put a cap on it yet lol
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Old 11-18-2008, 02:28 AM   #7
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Nice job. I would put a little scoop at the bottom of the tube to draw in air directly.
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Old 11-18-2008, 10:45 AM   #8
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cool, where did you get that tube from. also would i be able to put a cone filter instead of a flat drop in filter.
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Old 11-18-2008, 10:51 AM   #9
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thats pretty cool...A+ for effort ....i would put like a L shaped tube on the bottom of the pipe...this way air will actually be forced up the tube.
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Old 11-18-2008, 10:53 AM   #10
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nice work!
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Old 11-18-2008, 04:02 PM   #11
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Did the intake sound get any louder?
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Old 11-18-2008, 04:04 PM   #12
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I would figure out some way to put an additional filter in that tubing going down through the splash panel. Maybe it's just me but I would be way worried about a ton of cr@p/dirt/etc getting sucked up through that.

Definitely an A+ for effort man and very creative
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Old 11-18-2008, 04:05 PM   #13
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i have almost the same set up on my csl bumper i used the actual hole for the intake make sure u used a watersox or water could get in there and its bye bye after that!
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Old 11-21-2008, 12:12 AM   #14
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yea. lol I'm thinking about either doing this... or like a velocity stack. -_- or maybe i'll wait till the wet season is over so i dont have to get a water sock LOL! Very nice choice using exhaust tubing.

An in-line filter would be awesome~!
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Old 11-22-2008, 11:28 AM   #15
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what is a watersock?
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Old 11-22-2008, 11:56 AM   #16
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great job!

Where the air goes in the flexible looking the car on the front view? how and where did you fix it?
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Old 11-22-2008, 12:22 PM   #17
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A water sock is just something that keeps water out of the intake while allowing air to pass through. I have one on my K&N intake. Instead of opting for the screen, i would have gone with some kind of low density foam as a filter. I'm sure it would do a better job of keeping debris out of the tube as well as limit the amount of water that would enter in case of snow or rain.
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Old 11-22-2008, 02:37 PM   #18
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where can you get one of these watersocks?
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Old 12-14-2008, 01:31 AM   #19
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where can you get one of these watersocks?
ebay =)
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Old 01-02-2009, 10:07 PM   #20
LABMW13
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cool, where did you get that tube from. also would i be able to put a cone filter instead of a flat drop in filter.
I just got the tubing from Autozone for 9 dollars, as for the filter im not sure but probably not.
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UUC Parts: SSBC Brakes, Lines, Sway bars, 8LB Flywheel, twin disc clutch, Evo 3 Shifter, RK7A Shift Knob, CF E-brake, Rasp-X Mid Pipes
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