I've heard of a few tales of difficult filter installs so I thought a how-to
might be in order. Installing an air filter on the S4 is not difficult
with one exception--one clip on the back edge of the airbox can be challenging.
Also, to a novice, the web of hoses and wires on top of the airbox
might make some think twice. The good thing is none of hoses or wires need be removed to put in a new
filter; that simplifies things a great deal. Sorry this page takes such a
long time to load with a slow connection. Yup, I went overboard with the
pictures but I've heard a picture is worth a thousand words so...
The filter did not change the sound of the turbo or intake noise.