What I have done is modified the OEM Air Box to allow more flow along with more sound and add in a K&N Filter in the process. Now before we get started, I'm not telling you that you are going to pick up 50+ HP or that this is going to make your car sound like a jet taking off. Those are not my claims. With this modified air box I have noticed as well as a few other people who have done this modification, is this allows the turbo to spool up slightly quicker, produces the "whoosh" and "sucking" sound most are looking for and also retains the factory properties in design and shielding that help keep the intake cool by not removing the factory heat shield the car came with. This will also help by not restricting the air flow to two small inlets on the air box. All of this while looking stock from the top of the car.
Let's get to work.
Tools Required:
1 x Philips Head Screw Driver
1 x Flat head Screw Driver
1 x Paint Pen
1 x Demel or similar cutting tool.
1 x B7 A4 K&N Filter - (Mention this thread in your order comments for a free sticker!)
Step 1.) Remove the Stock Air Box from the car.
Step 2.) Trace a line on the bottom of the air box in a square pattern around the point that faces the passenger fender. You will notice that this portion of the Air Box sits on the outside of the frame rail away from the turbo. This is an area that collects air through the fog light grill. If you are worried you are taking too much start with a smaller amount and work your way out. Since I have done this on my car and a few others i knew were to go with the lines. You can use these as a reference point when making your outline.
Step 3.) Take the halves of the Air Box Apart by removing the two Philips Head screws.
Step 4.) Remove Air Filter (This box already had a K & N Filter inside so now is a good time to clean it out.)
Step 5.) With the filter out you can see all of the Sound Deadening Material they put into the box. This also traps a lot of crap in the bottom of the box where it collects. With this modification things like this will no longer collect in the bottom of the box when they come through the grill or the fender vent. The crud will simply fall out the bottom. The Red marks indicate where you will need to use the Flat Head Screw Driver to remove the material. Simply place the Flat Head between the air box and the material holder and twist
Step 6.) Now that you have removed the material from the air box you are ready to start cutting the box. Use the Dremel Tool that you have and a cutting wheel and follow your outlined path. REMEMBER TO WEAR EYE PROTECTION:
. You should be able to cut through this easily with the tool and it should not take long.
Step 7.) Now that you have the air box cut do some clean up around the edge. you should be able to use the Dremel tool or even some light sand paper or your fingers to remove the melted stringy plastic around the edge.
Step 8.) Once you have the box clean it's a good time to wash out the bottom of the box to remove any dirt or grime and shavings. Once this is complete you can reinstall the filter and reassemble the air box. Assembly is reverse of disassembly.
Step 9.) Reinstall in car and enjoy!!
Sound Clip of what this Modified Air Box sounds like in my JHM Avant with the JHM Stage 3 Turbo Kit installed:
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Originally Posted by dwinters14
2005.5 A4 2.0 (Red)TQ 6-spd, WORK IN PROGRESS 
2011 Police Interceptor 
...... I just read cut sounded pretty similar 
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