Mark P

Using some homemade means, I connected the K&N cone filter to the airbox via a
mandrel bent pipe.

<img src="http://ctny.audiworld.com/mark/s4/airboxmods/dsc05812.jpg">
<img src="http://ctny.audiworld.com/mark/s4/airboxmods/dsc05816.jpg">
<img src="http://ctny.audiworld.com/mark/s4/airboxmods/dsc05817.jpg"><ul><li><a href="http://ctny.audiworld.com/mark/s4/airboxmods/">http://ctny.audiworld.com/mark/s4/airboxmods/</a</li></ul>

Mark P

Here's 3 sets of data on my car (APR Stage 3) which show the following combinations of Airbox Hole Mod and Filter:

Blue - Stock S4 Airbox, OEM Audi Filter
Orange - S4 Airbox with 3" hole, OEM Audi Filter
Green - Stock S4 Airbox, K&amp;N Cone Filter

<img src="http://ctny.audiworld.com/mark/s4/airboxmods/hole_data031009/maf_cone_nohole1.gif">

Trendlines from the above graph:

<img src="http://ctny.audiworld.com/mark/s4/airboxmods/hole_data031009/maf_cone_nohole2.gif"><ul><li><a href="http://ctny.audiworld.com/mark/s4/airboxmods/hole_data031009/">http://ctny.audiworld.com/mark/s4/airboxmods/hole_data031009/</a</li></ul>

Roughedgez

Thats odd, so you lost airflow with the 3 inch hole over stock

blueS4 (vince)

Awesome job on detailing your procedure and testing here!

RocketBoy

The text you typed doesn't match the labels in the graph legend.

Angular

I second that and would like to know the dimensions of the pipe and the bend deg/radius.

Mark P

nope, typo in text - the legend was correct, fixed now

Mark P

corrected now

pattersom

Nice to someone try something new AND prove it made a difference.

Marin S4

Hook me up with that setup PLEASE!!!