ELEVENS

Always looking for extra performance. Now this air box is a very interesting. The cold-air ducting on the top comes off without tools. There's a plastic gravel-strainer-type filter that pops out. Mine had some dogwood tree fuzz. It looks like that pre-finter could really restrict airflow if it isn't cleaned regularly. Some Q's to those who know these things:

1) Does the entire airbox need to be removed to get at the paper filter?

2) What's that ~ 1" x 2" side hole for (goes into the fender)?

3) Why is there a (closed) flap on the bottom port (~3" round) and what activates the flap?

4) Does anyone make an aftermarket cold-air solution yet for the B7 RS4?

Jet Jockey/A4 Pilot

The one in the fender thing, all Audis have it. I suspect and that's a guess on my part, that the hole serves as a by-pass in case the main entry gets blocked but it might serve another purpose too under normal circumstance.

wagongotya

<img src="http://pictureposter.audiworld.com/90994/img_2814.jpg">

<img src="http://pictureposter.audiworld.com/90994/img_2816.jpg">

Fluffhead

at least that what it was for on my B6 S4.

wagongotya

It seriously takes 30 seconds to pull that top piece off.

Jet Jockey/A4 Pilot

Correct.

ELEVENS

It *might* flow better, but then you're sucking hot air from the engine compartment.

S4gasbord

I think he meant pull it off to adjust the headlight and then put it back in.

wagongotya

yes sir

ELEVENS

Duh, good point.