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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 07-05-2008, 02:42 AM   #1
e4sixxx
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diy velocity stack

hey guys this is my first write up for this forum, i dont know if anyone has done this before.. or have already made a thread about this....so i hope this help people. well i was bored today before the 4th of july BBQ and I felt like doing something to my car... i figured i should modify the stock intake system to get more air flow and dissipate heat... Las Vegas is a hot place... so with that said, keep all negative comments to yourself please.

i wanted to utilize the duct on the fog light covers i had. i figured using an old intake pipe, i could recreate the csl snorkle.

first off i cut the pipe to make fit in the duct,

secondly i cut a hole in the bottom corner of the stock air box.

and then i put the pipe thru the hole.

then re-assembled everything.. it was a total of 15 minutes of work. and 20 mins just to find the damn intake pipe in my garage lol

here are some pictures.

don't mind the fact i don't have a grill installed in the bumper.. stupid dealer gave me an mtech II grill rather than an m3, so i am waiting for the other grill to come in.
1


2


3


4


dont worry... i did put an intake filter in the box, i just didnt take the pic of it just so you can see it without the filter.

there was a better acceleration, and i hope this will better my gas mileage.


in the future i will loose the stock filter and integrate a knn cone filter inside of it, i already have the plans written out.

Last edited by e4sixxx; 07-05-2008 at 02:48 AM.
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Old 07-05-2008, 04:32 AM   #2
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cool nice job!
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Old 07-05-2008, 11:39 AM   #3
e4sixxx
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cool nice job!
thanks
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Old 07-05-2008, 04:00 PM   #4
e4sixxx
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i was doing research and i found out that this is similar to the Dinan system. also does anyone know if i can just buy the dinan air filter?
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Old 07-17-2008, 02:28 PM   #5
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gaaawd daaam
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Old 07-17-2008, 04:33 PM   #6
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so have you noticed any difference in performance?
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Old 07-18-2008, 04:10 PM   #7
e4sixxx
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Acceleration is a lot better and so is my gas mileage.
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Old 07-30-2008, 11:44 PM   #8
Dreamliner330
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What is the diameter of that pipe...where did you get it from?

I looked everywhere for some similar pipe and I ended up with some flexible ribbed 3"...which doesn't fit.

Anyways, what did you use, and where can I get it?

I'm considering modding my bumper, but I don't know, I might just stick the tube behind the fog light...or:

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Old 07-31-2008, 02:09 AM   #9
e4sixxx
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Originally Posted by Dreamliner330 View Post
What is the diameter of that pipe...where did you get it from?

I looked everywhere for some similar pipe and I ended up with some flexible ribbed 3"...which doesn't fit.

Anyways, what did you use, and where can I get it?

I'm considering modding my bumper, but I don't know, I might just stick the tube behind the fog light...or:

the pipe was from an old intake for a civic that i cut to make fit. the diameter is around 2 1/2 in. i bought the intake on ebay like 7 years ago lol but if you want the exact one just look for a 02 civic ex cold air intake, i just used the second part of the pipe that went behind the bumper.
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Old 07-31-2008, 03:08 AM   #10
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I posted how to pull the air from the front bumper directly here
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Old 07-31-2008, 08:31 AM   #11
e4sixxx
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I posted how to pull the air from the front bumper directly here
i did the same if you look at the first picture, the hole to the left on the fog light cover is where the opening of the intake is thus creating a velocity stack where air is forced into the pipe, rather than it be perpendicular to the air flow how some people have been doing it, also the dinan system. I've done it the way the csl snorkel is set up.



also the inside of the intake box was modified to use an aem cone filter



also i modified the intake channel behind the kidneys, i used a piece of aluminum to elongate the duct in order to create the ram air effect



and here it is with the hood closed, as you can see it is now directly in the path of the on coming air thus channeling the air directly into the intake box rather than it up higher in the under the hood.



hope this helps
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Old 07-31-2008, 08:43 AM   #12
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That "air ramp" is genius! I need to remember that when doing that mod!
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Old 07-31-2008, 08:43 AM   #13
e4sixxx
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i also sealed the opening where i cut to fit the pipe with silicone and i also put a grill on the pipe opening inside of the air box to prevent birds or any other large foreign objects and debris from being sucked in.
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Old 07-31-2008, 08:44 AM   #14
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That "air ramp" is genius! I need to remember that when doing that mod!
thanks bro
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Old 07-31-2008, 09:44 AM   #15
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nice setup..1 question, aren't you worried that water gets sucked in? Will there be enough suction to get water thru that hose?
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Old 07-31-2008, 10:06 AM   #16
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nice setup..1 question, aren't you worried that water gets sucked in? Will there be enough suction to get water thru that hose?
being in vegas, i dont think they'll be any water or flooded streets to worry about lol
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Old 07-31-2008, 10:17 AM   #17
e4sixxx
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nice setup..1 question, aren't you worried that water gets sucked in? Will there be enough suction to get water thru that hose?
no but just for added reassurance i made a plug that seals the hole perfectly, i keep in the trunk for that one day that it rains in las vegas.
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Old 07-31-2008, 10:23 AM   #18
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I did the ramp behind the grill years ago. Worked out well. I will try and find that thread.....



edit-- here ya go:
http://forum.e46fanatics.com/showthr...al+bondo+paint

Vaio and I did the same things you are doing! I never went ahead and made a duct to the bottom of the airbox though.
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Old 07-31-2008, 10:32 AM   #19
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Ever considered DIY'ing something like this?
http://forum.e46fanatics.com/showpos...1&postcount=37
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Old 07-31-2008, 10:35 AM   #20
e4sixxx
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Originally Posted by davidwarren View Post
I did the ramp behind the grill years ago. Worked out well. I will try and find that thread.....



edit-- here ya go:
http://forum.e46fanatics.com/showthr...al+bondo+paint

Vaio and I did the same things you are doing! I never went ahead and made a duct to the bottom of the airbox though.
that thing is sick
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