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Old 10-30-2012, 05:24 AM
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BentValve BentValve is offline
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Location: NH
Join Date: Sep 2010
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Mein Auto: 00 528i 3 pedals
Originally Posted by 520itouring View Post
So have you gained anything apart from a more throaty roar? Eg better/worse mpg/power/torque?

Thinking of putting a pvc cover over mine with a clamp but worried heat will sink in through the plastic into the intake boot from there? Also noticed a little trumpet type thing inside the air box? Can this be removed?

Finally are there any other restrictions in the oem air box that I can remove to improve sound guys?

What is the second smaller intake pipe on the air box for entering into the box from the top?

Sorry not familiar with the e39 intake set up!!
Had a few e46s in the past totally different air boxes.

I haven't really had a chance to analyze mpg gain/loss.
There is a good write up on the pvc mod if your boot is fine. In my case, I had to get a new one. The trumpet type thing is what I called the intake horn which I also removed. Not sure what else really you can remove and I'm not sure what the second smaller intake pipe is. Hopefully someone chimes in with an answer for that.

I will report back with an mpg analysis when I can.
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