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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 04-30-2010, 08:25 PM
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540ig5 540ig5 is offline
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Home made CAI (Possibly better then Dinan). Pics and details inside.

Four days ago I noticed that the rubber intake fitting that goes over the throttle body was ripped. To fix the issue I went down to my local performance shop to see if I can find a rubber/silicone coupling to fix the problem. While there I got to talking about a CAI and discovered that the shop had something I was looking for 3 years (I know it sounds too dramatic). It was a very high quality flex pipe. It was made with 3 layers of silicone and layers of nylon rope and metal coil. Really high quality stuff. Seeing this made me want to expand my project from fixing the ripped fitting to installing a full CAI, a real CAI, the kind I always envisioned, not the kind that mounts the filter under the hood. So with parts in hand I set off to undertake what I thought would be a relatively straight forward project.

The first surprise came when after taking off stock air box, the bumper and headlights. I think the word Iím looking for is shocked to describe the size, shape and general setup of the stock intake plumbing. Not only was the intake hole tiny, it faced towards the rear of the car and sucked in air right in front of the auxiliary fan. (So if the fan is on, it basically sucks air out of the intake.) I guess it was all made that way to make the 4.4L V8 quiet enough for soccer moms, but for me it was horrible. See pictures below.

Then using the flex pipe and an Autozone cone filter I went to work. For a rather large sedan, itís surprising how very very little room there is under the hood for any kind of modifications. There is literally just 1 or 2 millimeters of extra space for components (sometimes zero). I had to fight through the project the entire way. Starting from making sure the fan blades donít hit the MAF/Intake piping, to going crazy trying to fit the flex pipe between the stupid secondary air pump, the bumper and my fog lights, to finally finding a suitable place for the filter. It took me a total of 8 hours to put anything together, but man am I glad I did it. The car sounds absolutely amazing. I will try to post a sound bite later.
Anyways, enough talk, here are all the pics.
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